Author: "Hviid, Stubbe F." - Searchworks@Jio Institute Digital Library Search Results

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107 results on '"Hviid, Stubbe F."'

1. Deep Impact Observations by OSIRIS Onboard the Rosetta Spacecraft

Author: Keller, Horst Uwe, Jorda, Laurent, Küppers, Michael, Gutierrez, Pedro J., Hviid, Stubbe F., Knollenberg, Jörg, Lara, Luisa-Maria, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rickman, Hans, and Rodrigo, Rafael
Published: 2005

2. Boulders on Lutetia

Author: Küppers, Michael, Moissl, Richard, Vincent, Jean-Baptiste, Besse, Sébastien, Hviid, Stubbe F., Carry, Benoît, Grieger, Björn, Sierks, Holger, Keller, Horst Uwe, and Marchi, Simone
Published: 2012
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3. Morphology of the cloud tops as observed by the Venus Express Monitoring Camera

Author: Titov, Dmitrij V., Markiewicz, Wojciech J., Ignatiev, Nikolay I., Song, Li, Limaye, Sanjay S., Sanchez-Lavega, Agustin, Hesemann, Jonas, Almeida, Miguel, Roatsch, Thomas, Matz, Klaus-Dieter, Scholten, Frank, Crisp, David, Esposito, Larry W., Hviid, Stubbe F., Jaumann, Ralf, Keller, Horst U., and Moissl, Richard
Published: 2012
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4. Two independent and primitive envelopes of the bilobate nucleus of comet 67P

Author: Massironi, Matteo, Simioni, Emanuele, Marzari, Francesco, Cremonese, Gabriele, Giacomini, Lorenza, Pajola, Maurizio, Jorda, Laurent, Naletto, Giampiero, Lowry, Stephen, El-Maarry, Mohamed Ramy, Preusker, Frank, Scholten, Frank, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, AʼHearn, Michael F., Agarwal, Jessica, Auger, Anne-Thérèse, Barucci, Antonella M., Bertaux, Jean-Loup, Bertini, Ivano, Besse, Sebastien, Bodewits, Dennis, Capanna, Claire, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Gaskell, Robert, Groussin, Olivier, Gutiérrez, Pedro J., Güttler, Carsten, Hviid, Stubbe F., Ip, Wing-Huen, Knollenberg, Jörg, Kovacs, Gabor, Kramm, Rainer, Kührt, Ekkehard, Küppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Lin, Zhong-Yi, Lopez Moreno, Josè J., Magrin, Sara, Michalik, Harald, Mottola, Stefano, Oklay, Nilda, Pommerol, Antoine, Thomas, Nicolas, Tubiana, Cecilia, and Vincent, Jean-Baptiste
Published: 2015
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5. Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse

Author: Vincent, Jean-Baptiste, Bodewits, Dennis, Besse, Sébastien, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, AʼHearn, Michael F., Auger, Anne-Thérèse, Barucci, M. Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Capanna, Claire, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, El-Maarry, Mohamed Ramy, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Gaskell, Robert, Giacomini, Lorenza, Groussin, Olivier, Guilbert-Lepoutre, Aurélie, Gutierrez-Marques, P., Gutiérrez, Pedro J., Güttler, Carsten, Hoekzema, Nick, Höfner, Sebastian, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Jörg, Kovacs, Gabor, Kramm, Rainer, Kührt, Ekkehard, Küppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Lee, Vicky, Leyrat, Cédric, Lin, Zhong-Yi, Lopez Moreno, Josè J., Lowry, Stephen, Magrin, Sara, Maquet, Lucie, Marchi, Simone, Marzari, Francesco, Massironi, Matteo, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Pajola, Maurizio, Preusker, Frank, Scholten, Frank, Thomas, Nicolas, Toth, Imre, and Tubiana, Cecilia
Published: 2015
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6. Observations of Comet 9P/Tempel 1 around the Deep Impact event by the OSIRIS cameras onboard Rosetta

Author: Keller, Horst Uwe, Küppers, Michael, Fornasier, Sonia, Gutiérrez, Pedro J., Hviid, Stubbe F., Jorda, Laurent, Knollenberg, Jörg, Lowry, Stephen C., Rengel, Miriam, Bertini, Ivano, Cremonese, Gabriele, Ip, Wing-H., Koschny, Detlef, Kramm, Rainer, Kührt, Ekkehard, Lara, Luisa-Maria, Sierks, Holger, Thomas, Nicolas, Barbieri, Cesare, Lamy, Philippe, Rickman, Hans, Rodrigo, Rafael, A'Hearn, Michael F., Angrilli, Francesco, Barucci, Maria-Antonella, Bertaux, Jean-Loup, da Deppo, Vania, Davidsson, Björn J.R., de Cecco, Mariolino, Debei, Stefano, Fulle, Marco, Gliem, Fritz, Groussin, Olivier, Lopez Moreno, José J., Marzari, Francesco, Naletto, Giampiero, Sabau, Lola, Sanz Andrés, Angel, and Wenzel, Klaus-Peter
Published: 2007
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7. A large dust/ice ratio in the nucleus of comet 9P/Tempel 1

Author: Kuppers, Michael, Bertini, Ivano, Fornasier, Sonia, Gutierrez, Pedro J., Hviid, Stubbe F., Jorda, Laurent, Keller, Horst Uwe, Knollenberg, Jorg, Koschny, Detlef, Kramm, Rainer, Lara, Luisa-Maria, Sierks, Holger, Thomas, Nicolas, Barbieri, Cesare, Lamy, Philippe, Rickman, Hans, and Rodrigo, Rafael
Subjects: Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract: Author(s): Michael KÃ¼ppers (corresponding author) [1]; Ivano Bertini [2]; Sonia Fornasier [2]; Pedro J. Gutierrez [3]; Stubbe F. Hviid [1]; Laurent Jorda [4]; Horst Uwe Keller [1]; JÃ¶rg Knollenberg [5]; [...]
Published: 2005
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8. Indication of drier periods on Mars from the chemistry and mineralogy of atmospheric dust

Author: Goetz, Walter, Bertelsen, Preben, Binau, Charlotte S., Gunnlaugsson, Haraldur P., Hviid, Stubbe F., Kinch, Kjartan M., Madsen, Daniel E., Madsen, Morten B., Olsen, Malte, Gellert, Ralf, Klingelhofer, Gostar, Ming, Douglas W., Morris, Richard V., Rieder, Rudolf, Rodionov, Daniel S., de Souza, Jr, Paulo A., Schroder, Christian, Squyres, Steve W., Wdowiak, Tom, and Yen, Albert
Subjects: Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract: Author(s): Walter Goetz (corresponding author) [1]; Preben Bertelsen [2]; Charlotte S. Binau [2]; Haraldur P. Gunnlaugsson [3]; Stubbe F. Hviid [1]; Kjartan M. Kinch [3]; Daniel E. Madsen [2]; Morten [...]
Published: 2005
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9. Correlation of Comet 67P/CG'S Morphology with the Occurrence of Exposed Water Ice Patches

Author: Arnold, Gabriele, Weller, D., Zeilinger, G., Kappel, David, Hviid, Stubbe F., Kührt, Ekkehard, Moroz, Lyuba V., Markus, Kathrin, Henckel, D., Capaccioni, Fabrizio, Filacchione, Gianrico, Erard, Stéphane, Bockelée-Morvan, Dominique, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik und Astronomie, Universität Potsdam, DLR, Istituto di Astrofisica e Planetologia Spaziali, INAF (IAPS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience; Introduction: Comet 67P's surface is quite homogeneously covered by dark refractory materials rich in organics [1,2]. Rare water ice expo- sures on the surface, most likely originating from sub-surface layers, have recently been discovered [3,4]. Such H2O ice patches on 67P's Imhotep region in the pre-perihelion phase were ex- amined and related to the local morphology to understand the exposure mechanisms [5]. Methods: H2O ice was identified in two study areas using characteristic H2O spectral features observed by the VIRTIS-M instrument [1]: absorption bands at 1.04, 1.25, 1.52, 2.02, 2.96 mum, and the VIS spectral slope (0.5-0.8 mum). Corresponding normalized spectral indicators were projected onto a 3D digital shape model (DSM) of 67P [6], along with high spatial resolution images acquired by OSIRIS [7] for morphological context. Results and conclusions: The 2.0-mum absorption band proved to be the most sensitive H2O indicator in the IR. Flat (bluer) normalized VIS slopes correlate very well with depths of H2O ice absorption bands. The DSM projections show a significant spatial correlation between spectral H2O indicators and morphological features. H2O ice deposits were identified in two areas, each extending over hundreds of square meters. Both are located at the bases of steep-sloped (>60°) walls of Consolidated Cometary Material (CCM) on debris falls that came to rest on moderately inclined (20°-30°) terrain, pointing towards gravitational lows. Both deposits are located in poorly illuminated areas due to shadowing from close-by steep walls. The morphological and photometrical properties of these deposits appear to be stable over months. Spectral modeling [3,4] indicated the presence of large (mm-sized) H2O ice grains. Such grains form through vapor diffusion in ice-rich colder layers or by sintering and are exposed by erosion [3]. The CCM in both study areas was fractured and weakened by thermal fatigue and sublimation, leading to the collapse of overhangs in one single event or in small steps over a longer time. For study area 1 this interpretation is supported by a small remnant H2O ice patch in the upper part of the steep wall indicating the original location of the collapse overhang. Sinkhole-structures on the CCM in study area 2 indicate sub-surface activity connected to ice sublimation, thermal stress, and occasional outbursts. Even though the nucleus structure probably is mostly homogeneous and primordial, the variable size and irregular distribution of sink-holes and erosional features strongly imply a highly active and heterogeneous sub-surface layer of at least tens of meters [8,9]. References: [1] Capaccioni F. et al. (2015) Sci- ence, 347, 628. [2] Quirico E. et al. (2016) Ica- rus, 272, 32-47. [3] Filacchione G. et al. (2016) Nature, 529, 368-372. [4] Barucci A. et al. (2016) A&A, 595, A102. [5] Weller D. (2016) Master thesis, University of Potsdam. [6] Preusker F. et al. (2015) A&A, 583, A33. [7] Keller H. et al. (2007) Space Sci. Rev., 128(1), 433-506. [8] Thomas N. et al. (2015) Science, 347, 440. [9] Vincent J.B. et al. (2015) Nature, 523, 63-66.
Published: 2017

10. First analysis of the size-frequency distribution of boulders ≥ 7m on comet 67P

Author: Pajola, Maurizio, Vincent, Jean-Baptiste, Güttler, Carsten, Lee, Jui-Chi, Massironi, Matteo, Bertini, Ivano, Simioni, Emanuele, Marzari, Francesco, Giacomini, Lorenza, Barbieri, Cesare, Cremonese, Gabriele, Naletto, Giampiero, Pommerol, Antoine, El-Maarry, Mohamed Ramy, Besse, Sébastien, Küppers, Michael, La Forgia, Fiorangela, Lazzarin, Monica, Thomas, Nicholas, Auger, Anne-Thérèse, Ip, W.-H., Lin, Zhong-Yi, Sierks, Holger, A'Hearn, M. F., Barucci, Maria Antonella, Bertaux, Jean-Loup, da Deppo, Vania, Davidsson, Björn, de Cecco, M., Debei, Stefano, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Hviid, Stubbe F., Jorda, Laurent, Keller, Horst Uwe, Knollenberg, Jörg, Koschny, Detlef, Kramm, Rainer, Kürt, Ekkehard, Lamy, Philippe, Lara, Luisa M., López-Moreno, José J., Magrin, Sara, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Oklay, Nilda, Preusker, Frank, Rickman, Hans, Rodrigo, Rafael, Scholten, Frank, Tubiana, Cecilia, Centro di Ateneo di Studi e Attività Spaziali 'Giuseppe Colombo' (CISAS), Università degli Studi di Padova = University of Padua (Unipd), Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Max-Planck-Gesellschaft, Institute of Space Science [Taiwan], National Central University [Taiwan] (NCU), Dipartimento di Geoscienze [Padova], CNR Istituto di Fotonica e Nanotecnologie [Padova] (IFN), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Dipartimento di Fisica e Astronomia 'Galileo Galilei', INAF - Osservatorio Astronomico di Padova (OAPD), Istituto Nazionale di Astrofisica (INAF), Department of Information Engineering [Padova] (DEI), Physikalisches Institut [Bern], Universität Bern [Bern] (UNIBE), European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), Operations Department (ESAC), European Space Astronomy Centre (ESAC), Agence Spatiale Européenne = European Space Agency (ESA)-Agence Spatiale Européenne = European Space Agency (ESA), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Department of Astronomy [College Park], University of Maryland [College Park], University of Maryland System-University of Maryland System, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), CNR Institute for Photonics and Nanotechnologies (IFN), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Università degli Studi di Trento (UNITN), Department of Industrial Engineering [Padova], Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), INAF - Osservatorio Astronomico di Trieste (OAT), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), DLR Institut für Planetenforschung, and Deutsches Zentrum für Luft- und Raumfahrt [Berlin] (DLR)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2016

11. Interest of Stereophotoclinometry Models for Geological Studies

Author: Jorda, Laurent, Auger, Anne-Thérèse, Bouley, Sylvain, Capanna, Claire, Gaskell, Robert W., Groussin, Olivier, Lamy, Philippe, Hviid, Stubbe F., Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Géosciences Paris Saclay (GEOPS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Astéroïdes, comètes, météores et éphémérides (ACME), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Planetary Science Institute, and Deutsches Zentrum für Luft- und Raumfahrt (DLR)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience; New techniques have been developed during the last decade to reconstruct the global and/or local topography of solar system objects from visible images. These techniques called "stereophotoclinometry" combine the stereo information extracted from image patches with pixel-to-pixel variations of the intensity on a set of images of the same area. These techniques can complement the classical stereophotogrammetry approach. We will discuss how stereophotoclinometry techniques can contribute to geomorphology studies by revealing the 3D structure of fine and narrow features observed on visible images but not always captured in 3D terrain models. Our discussion will be illustrated by examples taken from sets of images acquired by the OSIRIS imaging instrument onboard the ROSETTA spacecraft, for which both stereophotogrammetry and stereophotoclinometry models are available.
Published: 2015

12. The southern hemisphere of 67P/Churyumov-Gerasimenko : Analysis of the preperihelion size-frequency distribution of boulders >= 7m

Author: Pajola, Maurizio, Lucchetti, Alice, Vincent, Jean-Baptiste, Oklay, Nilda, El-Maarry, Mohamed R., Bertini, Ivano, Naletto, Giampiero, Lazzarin, Monica, Massironi, Matteo, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst U., Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria A., Bertaux, Jean-Loup, Boudreault, Steve, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Bjorn, Debei, Stefano, De Cecco, Mariolino, Deller, Jakob, Fornasier, Sonia, Fulle, Marco, Gicquel, Adeline, Groussin, Olivier, Gutierrez, Pedro J., Guetler, Carsten, Hofmann, Marc, Hoefner, Sebastian, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kuehrt, Ekkehard, Kuppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lee, Jui-Chi, Lin, Zhong-Yi, Lopez Moreno, Jose J., Marzari, Francesco, Michalik, Harald, Mottola, Stefano, Preusker, Frank, Scholten, Frank, Thomas, Nicholas, Toth, Imre, Tubiana, Cecilia, Pajola, Maurizio, Lucchetti, Alice, Vincent, Jean-Baptiste, Oklay, Nilda, El-Maarry, Mohamed R., Bertini, Ivano, Naletto, Giampiero, Lazzarin, Monica, Massironi, Matteo, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst U., Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria A., Bertaux, Jean-Loup, Boudreault, Steve, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Bjorn, Debei, Stefano, De Cecco, Mariolino, Deller, Jakob, Fornasier, Sonia, Fulle, Marco, Gicquel, Adeline, Groussin, Olivier, Gutierrez, Pedro J., Guetler, Carsten, Hofmann, Marc, Hoefner, Sebastian, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kuehrt, Ekkehard, Kuppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lee, Jui-Chi, Lin, Zhong-Yi, Lopez Moreno, Jose J., Marzari, Francesco, Michalik, Harald, Mottola, Stefano, Preusker, Frank, Scholten, Frank, Thomas, Nicholas, Toth, Imre, and Tubiana, Cecilia
Abstract: Aims. We calculate the size-frequency distribution of the boulders on the southern hemisphere of comet 67P Churyumov-Gerasimenko (67P), which was in shadow before the end of April 2015. We compare the new results with those derived from the northern hemisphere and equatorial regions of 67P, highlighting the possible physical processes that lead to these boulder size distributions. Methods. We used images acquired by the OSIRIS Narrow Angle Camera (NAC) on 2 May 2015 at a distance of 125 km from the nucleus. The scale of this dataset is 2.3 m/px; the high resolution of the images, coupled with the favorable observation phase angle of 62 degrees, provided the possibility to unambiguously identify boulders >= 7 m on the surface of 67P and to manually extract them with the software ArcGIS. We derived the size-frequency distribution of the illuminated southern hemisphere. Results. We found a power-law index of -3.6 +/- 0.2 for the boulders on the southern hemisphere with a diameter range of 7-35 m. The power-law index is equal to the one previously found on northern and equatorial regions of 67P, suggesting that similar boulder formation processes occur in both hemispheres. The power-law index is related to gravitational events triggered by sublimation and/or thermal fracturing causing regressive erosion. In addition, the presence of a larger number of boulders per km(2) in the southern hemisphere, which is a factor of 3 higher with respect to the northern hemisphere, suggests that the southernmost terrains of 67P are affected by a stronger thermal fracturing and sublimating activity, hence possibly causing larger regressive erosion and gravitational events.
Published: 2016
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13. Aswan site on comet 67P/Churyumov-Gerasimenko : Morphology, boulder evolution, and spectrophotometry

Author: Pajola, Maurizio, Oklay, Nilda, La Forgia, Fiorangela, Giacomini, Lorenza, Massironi, Matteo, Bertini, Ivano, El-Maarry, M. R., Marzari, Francesco, Preusker, Frank, Scholten, Frank, Hoefner, Sebastian, Lee, Jui-Chi, Vincent, Jean-Baptiste, Groussin, Olivier, Naletto, Giampiero, Lazzarin, Monica, Barbieri, Cesare, Sierks, Holger, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst U., Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria A., Bertaux, Jean-Loup, Cremonese, Gabriele, Da Deppoll, Vania, Davidsson, Bjoern, De Cecco, Mariolino, Debei, Stefano, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Guettler, Carsten, Gutierrez, Pedro J., Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kueppers, Michael, Kuert, Ekkehard, Lara, Luisa M., Lin, Zhong-Yi, Moreno, Jose J. Lopez, Magrin, Sara, Michalik, Harald, Mottola, Stefano, Thomas, Nicholas, Tubiana, Cecilia, Pajola, Maurizio, Oklay, Nilda, La Forgia, Fiorangela, Giacomini, Lorenza, Massironi, Matteo, Bertini, Ivano, El-Maarry, M. R., Marzari, Francesco, Preusker, Frank, Scholten, Frank, Hoefner, Sebastian, Lee, Jui-Chi, Vincent, Jean-Baptiste, Groussin, Olivier, Naletto, Giampiero, Lazzarin, Monica, Barbieri, Cesare, Sierks, Holger, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst U., Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria A., Bertaux, Jean-Loup, Cremonese, Gabriele, Da Deppoll, Vania, Davidsson, Bjoern, De Cecco, Mariolino, Debei, Stefano, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Guettler, Carsten, Gutierrez, Pedro J., Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kueppers, Michael, Kuert, Ekkehard, Lara, Luisa M., Lin, Zhong-Yi, Moreno, Jose J. Lopez, Magrin, Sara, Michalik, Harald, Mottola, Stefano, Thomas, Nicholas, and Tubiana, Cecilia
Abstract: Aims. We provide a detailed morphological analysis of the Aswan site on comet 67P/Churyumov-Gerasimenko (67P). We derive the size-frequency distribution of boulders >= 2 m and correlate this distribution with the gravitational slopes for the first time on a comet. We perform the spectral analysis of this region to understand if possible surface variegation is related to the different surface textures observable on the different units. Methods. We used two OSIRIS Narrow Angle Camera (NAC) image data sets acquired on September 19 and 22, 2014, with a scale of 0.5 m/px. Gravitational slopes derived from the 3D shape model of 67P were used to identify and interpret the different units of the site. By means of the high-resolution NAC data sets, boulders >= 2.0 m can be unambiguously identified and extracted using the software ArcGIS. Coregistered and photometrically corrected color cubes were used to perform the spectral analyses, and we retrieved the spectral properties of the Aswan units. Results. The high-resolution morphological map of the Aswan site (0.68 km(2)) shows that this site is characterized by four different units: fine-particle deposits located on layered terrains, gravitational accumulation deposits, taluses, and the outcropping layered terrain. Multiple lineaments are identified on the Aswan cliff, such as fractures, exposed layered outcrops, niches, and terraces. Close to the terrace margin, several arched features observed in plan view suggest that the margin progressively retreats as a result of erosion. The size-frequency of boulders >= 2 m in the entire study area has a power-law index of -3.9 +0.2/-0.3 (1499 boulders >= 2 m/km(2)), suggesting that the Aswan site is mainly dominated by gravitational events triggered by sublimation and/or thermal insolation weathering causing regressive erosion. The boulder size-frequency distribution versus gravitational slopes indicates that when higher gravitational slope terrains are considered, only
Published: 2016
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14. Gas outflow and dust transport of comet 67P/Churyumov-Gerasimenko

Author: Lai, Ian-Lin, Ip, Wing-Huen, Su, Cheng-Chin, Wu, Jong-Shinn, Lee, Jui-Chi, Lin, Zhong-Yi, Liao, Ying, Thomas, Nicolas, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Boudreault, Steven, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Deller, Jakob, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Guttler, Carsten, Hofmann, Marc, Hviid, Stubbe F., Jorda, Laurent, Knollenberg, J. Org, Kovacs, Gabor, Kramm, J. -Rainer, Kuhrt, Ekkehard, Kuppers, Michael, Lara, Luisa M., Lazzarin, Monica, Moreno, Jose J. Lopez, Marzari, Francesco, Naletto, Giampiero, Oklay, Nilda, Shi, Xian, Tubiana, Cecilia, Vincent, Jean-Baptiste, Lai, Ian-Lin, Ip, Wing-Huen, Su, Cheng-Chin, Wu, Jong-Shinn, Lee, Jui-Chi, Lin, Zhong-Yi, Liao, Ying, Thomas, Nicolas, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Boudreault, Steven, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Deller, Jakob, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Guttler, Carsten, Hofmann, Marc, Hviid, Stubbe F., Jorda, Laurent, Knollenberg, J. Org, Kovacs, Gabor, Kramm, J. -Rainer, Kuhrt, Ekkehard, Kuppers, Michael, Lara, Luisa M., Lazzarin, Monica, Moreno, Jose J. Lopez, Marzari, Francesco, Naletto, Giampiero, Oklay, Nilda, Shi, Xian, Tubiana, Cecilia, and Vincent, Jean-Baptiste
Abstract: Because of the diurnal thermal cycle and the irregular shape of the nucleus, gas outflow of comet 67P/Churyumov-Gerasimenko could be highly anisotropic as indicated by the colliminated dust jet structures on the sunlit side. Based on the OSIRIS imaging observations of the outgassing effect, a simple model of surface sublimation can be constructed by taking into account the dependence on the solar insolation. With preliminary information on the time variability of the global gas production rate, a sequence of gas coma models can be generated at different epochs before and after perihelion. We also investigate different patterns of dust particle dynamics under the influences of nuclear rotation and gas drag. From these considerations, a consistent picture of the spatial distribution of dusty materials across the surface of comet 67P as it moves around the perihelion can be developed. It is found that because of the redeposition of the ejected dust from the Southern hemisphere to the Northern hemisphere during the southern summer season the Hapi region could gain up to 0.4 m while the Wosret region would lose up to 1.8 m of dust mantle per orbit.
Published: 2016
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15. Geomorphological mapping of comet 67P/Churyumov-Gerasimenko's Southern hemisphere

Author: Lee, Jui-Chi, Massironi, Matteo, Ip, Wing-Huen, Giacomini, Lorenza, Ferrari, Sabrina, Penasa, Luca, El-Maarry, Mohamed Ramy, Pajola, Maurizio, Lai, Ian-Lin, Lin, Zhong-Yi, Ferri, Francesca, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Deller, Jakob, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Guettler, Carsten, Hofmann, Marc, Hviid, Stubbe F., Jorda, Laurent, Knollenberg, Joerg, Kovacs, Gabor, Kramm, J. -Rainer, Kuehrt, Ekkehard, Kuppers, Michael, Lara, Luisa M., Lazzarin, Monica, Marzari, Francesco, Lopez Moreno, Jose J., Naletto, Giampiero, Oklay, Nilda, Shi, Xian, Thomas, Nicolas, Tubiana, Cecilia, Vincent, Jean-Baptiste, Lee, Jui-Chi, Massironi, Matteo, Ip, Wing-Huen, Giacomini, Lorenza, Ferrari, Sabrina, Penasa, Luca, El-Maarry, Mohamed Ramy, Pajola, Maurizio, Lai, Ian-Lin, Lin, Zhong-Yi, Ferri, Francesca, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Deller, Jakob, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Guettler, Carsten, Hofmann, Marc, Hviid, Stubbe F., Jorda, Laurent, Knollenberg, Joerg, Kovacs, Gabor, Kramm, J. -Rainer, Kuehrt, Ekkehard, Kuppers, Michael, Lara, Luisa M., Lazzarin, Monica, Marzari, Francesco, Lopez Moreno, Jose J., Naletto, Giampiero, Oklay, Nilda, Shi, Xian, Thomas, Nicolas, Tubiana, Cecilia, and Vincent, Jean-Baptiste
Abstract: In 2015 May, the Southern hemisphere of comet 67P/Churyumov-Gerasimenko became visible by the OSIRIS cameras on-board the Rosetta spacecraft. The resolution was high enough to carry out a detailed analysis of the surface morphology, which is quite different from the Northern hemisphere. Previous works show that fine particle deposits are the most extensive geological unit in the Northern hemisphere. In contrast, the Southern hemisphere is dominated by outcropping consolidated terrain. In this work, we provide geomorphological maps of the Southern hemisphere with the distinction of both geological units and linear features. The geomorphological maps described in this study allow us to gain a better understanding of the processes shaping the comet nucleus and the distribution of primary structures such as fractures and strata.
Published: 2016
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16. Gas outflow and dust transport of comet 67P/Churyumov–Gerasimenko

Author: Lai, Ian-Lin, primary, Ip, Wing-Huen, additional, Su, Cheng-Chin, additional, Wu, Jong-Shinn, additional, Lee, Jui-Chi, additional, Lin, Zhong-Yi, additional, Liao, Ying, additional, Thomas, Nicolas, additional, Sierks, Holger, additional, Barbieri, Cesare, additional, Lamy, Philippe, additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst Uwe, additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Barucci, Maria Antonella, additional, Bertaux, Jean-Loup, additional, Bertini, Ivano, additional, Boudreault, Steven, additional, Cremonese, Gabriele, additional, Da Deppo, Vania, additional, Davidsson, Björn, additional, Debei, Stefano, additional, De Cecco, Mariolino, additional, Deller, Jakob, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Groussin, Olivier, additional, Gutiérrez, Pedro J., additional, Güttler, Carsten, additional, Hofmann, Marc, additional, Hviid, Stubbe F., additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kovacs, Gabor, additional, Kramm, J.-Rainer, additional, Kührt, Ekkehard, additional, Küppers, Michael, additional, Lara, Luisa M., additional, Lazzarin, Monica, additional, Lopez Moreno, Josè J., additional, Marzari, Francesco, additional, Naletto, Giampiero, additional, Oklay, Nilda, additional, Shi, Xian, additional, Tubiana, Cecilia, additional, and Vincent, Jean-Baptiste, additional
Published: 2016
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17. Geomorphological mapping of comet 67P/Churyumov–Gerasimenko’s Southern hemisphere

Author: Lee, Jui-Chi, primary, Massironi, Matteo, additional, Ip, Wing-Huen, additional, Giacomini, Lorenza, additional, Ferrari, Sabrina, additional, Penasa, Luca, additional, El-Maarry, Mohamed Ramy, additional, Pajola, Maurizio, additional, Lai, Ian-Lin, additional, Lin, Zhong-Yi, additional, Ferri, Francesca, additional, Sierks, Holger, additional, Barbieri, Cesare, additional, Lamy, Philippe, additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst Uwe, additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Barucci, Maria Antonella, additional, Bertaux, Jean-Loup, additional, Bertini, Ivano, additional, Cremonese, Gabriele, additional, Da Deppo, Vania, additional, Davidsson, Björn, additional, Debei, Stefano, additional, De Cecco, Mariolino, additional, Deller, Jakob, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Groussin, Olivier, additional, Gutiérrez, Pedro J., additional, Güttler, Carsten, additional, Hofmann, Marc, additional, Hviid, Stubbe F., additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kovacs, Gabor, additional, Kramm, J.-Rainer, additional, Kührt, Ekkehard, additional, Küppers, Michael, additional, Lara, Luisa M., additional, Lazzarin, Monica, additional, Marzari, Francesco, additional, Lopez Moreno, Josè J., additional, Naletto, Giampiero, additional, Oklay, Nilda, additional, Shi, Xian, additional, Thomas, Nicolas, additional, Tubiana, Cecilia, additional, and Vincent, Jean-Baptiste, additional
Published: 2016
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18. Aswan site on comet 67P/Churyumov-Gerasimenko: Morphology, boulder evolution, and spectrophotometry

Author: Pajola, Maurizio, primary, Oklay, Nilda, additional, La Forgia, Fiorangela, additional, Giacomini, Lorenza, additional, Massironi, Matteo, additional, Bertini, Ivano, additional, El-Maarry, M. R., additional, Marzari, Francesco, additional, Preusker, Frank, additional, Scholten, Frank, additional, Höfner, Sebastian, additional, Lee, Jui-Chi, additional, Vincent, Jean-Baptiste, additional, Groussin, Olivier, additional, Naletto, Giampiero, additional, Lazzarin, Monica, additional, Barbieri, Cesare, additional, Sierks, Holger, additional, Lamy, Philippe, additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst U., additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Barucci, Maria A., additional, Bertaux, Jean-Loup, additional, Cremonese, Gabriele, additional, Deppo, Vania Da, additional, Davidsson, Björn, additional, De Cecco, Mariolino, additional, Debei, Stefano, additional, Ferri, Francesca, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Güttler, Carsten, additional, Gutierrez, Pedro J., additional, Hviid, Stubbe F., additional, Ip, Wing-Huen, additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kramm, J.-Rainer, additional, Küppers, Michael, additional, Kürt, Ekkehard, additional, Lara, Luisa M., additional, Lin, Zhong-Yi, additional, Lopez Moreno, Jose J., additional, Magrin, Sara, additional, Michalik, Harald, additional, Mottola, Stefano, additional, Thomas, Nicholas, additional, and Tubiana, Cecilia, additional
Published: 2016
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19. The southern hemisphere of 67P/Churyumov-Gerasimenko: Analysis of the preperihelion size-frequency distribution of boulders ≥7 m

Author: Pajola, Maurizio, primary, Lucchetti, Alice, additional, Vincent, Jean-Baptiste, additional, Oklay, Nilda, additional, El-Maarry, Mohamed R., additional, Bertini, Ivano, additional, Naletto, Giampiero, additional, Lazzarin, Monica, additional, Massironi, Matteo, additional, Sierks, Holger, additional, Barbieri, Cesare, additional, Lamy, Philippe, additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst U., additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Barucci, Maria A., additional, Bertaux, Jean-Loup, additional, Boudreault, Steve, additional, Cremonese, Gabriele, additional, Deppo, Vania Da, additional, Davidsson, Björn, additional, Debei, Stefano, additional, De Cecco, Mariolino, additional, Deller, Jakob, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Gicquel, Adeline, additional, Groussin, Olivier, additional, Gutierrez, Pedro J., additional, Güttler, Carsten, additional, Hofmann, Marc, additional, Höfner, Sebastian, additional, Hviid, Stubbe F., additional, Ip, Wing-Huen, additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kramm, J.-Rainer, additional, Kührt, Ekkehard, additional, Küppers, Michael, additional, La Forgia, Fiorangela, additional, Lara, Luisa M., additional, Lee, Jui-Chi, additional, Lin, Zhong-Yi, additional, Lopez Moreno, Jose J., additional, Marzari, Francesco, additional, Michalik, Harald, additional, Mottola, Stefano, additional, Preusker, Frank, additional, Scholten, Frank, additional, Thomas, Nicholas, additional, Toth, Imre, additional, and Tubiana, Cecilia, additional
Published: 2016
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20. Compositional Variations of Rocknest Sand, Gale Crater, Mars

Author: Goetz, Walter, Madsen, Morten B., Edgett, Kenneth S., Clark, Benton C., Meslin, Pierre-Yves, Blaney, Diana L., Bridges, Nathan, Fisk, Martin, Hviid, Stubbe F., Kocurek, Gary, Lasue, Jeremie, Maurice, Sylvestre, Newsom, Horton, Renno, Nilton, Rubin, David M., Sullivan, Robert, Wiens, Roger C., and Martin-Torres, Javier
Subjects: Rymd- och flygteknik, Aerospace Engineering
Abstract: Upprättat; 2013; 20150701 (ninhul)
Published: 2013

21. Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun

Author: Rotundi, Alessandra, Sierks, Holger, Della Corte, Vincenzo, Fulle, Marco, Gutierrez, Pedro J., Lara, Luisa, Barbieri, Cesare, Lamy, Philippe L., Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Lopez-Moreno, Jose J., Accolla, Mario, Agarwal, Jessica, A'Hearn, Michael F., Altobelli, Nicolas, Angrilli, Francesco, Barucci, M. Antonietta, Bertaux, Jean-Loup, Bertini, Ivano, Bodewits, Dennis, Bussoletti, Ezio, Colangeli, Luigi, Cosi, Massimo, Cremonese, Gabriele, Crifo, Jean-Francois, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Esposito, Francesca, Ferrari, Marco, Fornasier, Sonia, Giovane, Frank, Gustafson, Bo, Green, Simon F., Groussin, Olivier, Gruen, Eberhard, Guettler, Carsten, Herranz, Miguel L., Hviid, Stubbe F., Ip, Wing, Ivanovski, Stavro, Jernimo, Jose M., Jorda, Laurent, Knollenberg, Joerg, Kramm, Rainer, Kuehrt, Ekkehard, Kueppers, Michael, Lazzarin, Monica, Leese, Mark R., Lopez-Jimenez, Antonio C., Lucarelli, Francesca, Lowry, Stephen C., Marzari, Francesco, Epifani, Elena Mazzotta, McDonnell, J. Anthony M., Mennella, Vito, Michalik, Harald, Molina, Antonio, Morales, Rafael, Moreno, Fernando, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Ortiz, Jose L., Palomba, Ernesto, Palumbo, Pasquale, Perrin, Jean-Marie, Rodriguez, Julio, Sabau, Lola, Snodgrass, Colin, Sordini, Roberto, Thomas, Nicolas, Tubiana, Cecilia, Vincent, Jean-Baptiste, Weissman, Paul, Wenzel, Klaus-Peter, Zakharov, Vladimir, Zarnecki, John C., Rotundi, Alessandra, Sierks, Holger, Della Corte, Vincenzo, Fulle, Marco, Gutierrez, Pedro J., Lara, Luisa, Barbieri, Cesare, Lamy, Philippe L., Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Lopez-Moreno, Jose J., Accolla, Mario, Agarwal, Jessica, A'Hearn, Michael F., Altobelli, Nicolas, Angrilli, Francesco, Barucci, M. Antonietta, Bertaux, Jean-Loup, Bertini, Ivano, Bodewits, Dennis, Bussoletti, Ezio, Colangeli, Luigi, Cosi, Massimo, Cremonese, Gabriele, Crifo, Jean-Francois, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, De Cecco, Mariolino, Esposito, Francesca, Ferrari, Marco, Fornasier, Sonia, Giovane, Frank, Gustafson, Bo, Green, Simon F., Groussin, Olivier, Gruen, Eberhard, Guettler, Carsten, Herranz, Miguel L., Hviid, Stubbe F., Ip, Wing, Ivanovski, Stavro, Jernimo, Jose M., Jorda, Laurent, Knollenberg, Joerg, Kramm, Rainer, Kuehrt, Ekkehard, Kueppers, Michael, Lazzarin, Monica, Leese, Mark R., Lopez-Jimenez, Antonio C., Lucarelli, Francesca, Lowry, Stephen C., Marzari, Francesco, Epifani, Elena Mazzotta, McDonnell, J. Anthony M., Mennella, Vito, Michalik, Harald, Molina, Antonio, Morales, Rafael, Moreno, Fernando, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Ortiz, Jose L., Palomba, Ernesto, Palumbo, Pasquale, Perrin, Jean-Marie, Rodriguez, Julio, Sabau, Lola, Snodgrass, Colin, Sordini, Roberto, Thomas, Nicolas, Tubiana, Cecilia, Vincent, Jean-Baptiste, Weissman, Paul, Wenzel, Klaus-Peter, Zakharov, Vladimir, and Zarnecki, John C.
Abstract: Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.4 astronomical units inbound, GIADA and OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, and 48 grains of mass 10(-5) to 10(-2) kilograms, respectively. Combined with gas data from the MIRO (Microwave Instrument for the Rosetta Orbiter) and ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) instruments, we find a dust/gas mass ratio of 4 +/- 2 averaged over the sunlit nucleus surface. A cloud of larger grains also encircles the nucleus in bound orbits from the previous perihelion. The largest orbiting clumps are meter-sized, confirming the dust/gas ratio of 3 inferred at perihelion from models of dust comae and trails.
Published: 2015
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22. On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko

Author: Sierks, Holger, Barbieri, Cesare, Lamy, Philippe L., Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Angrilli, Francesco, Auger, Anne-Therese, Barucci, M. Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Besse, Sebastien, Bodewits, Dennis, Capanna, Claire, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Bjoern, Debei, Stefano, De Cecco, Mariolino, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Gaskell, Robert, Giacomini, Lorenza, Groussin, Olivier, Gutierrez-Marques, Pablo, Gutiuerrez, Pedro J., Guettler, Carsten, Hoekzema, Nick, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kovacs, Gabor, Kramm, J. Rainer, Kuehrt, Ekkehard, Kueppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Leyrat, Cedric, Moreno, Jose J. Lopez, Magrin, Sara, Marchi, Simone, Marzari, Francesco, Massironi, Matteo, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Pajola, Maurizio, Pertile, Marco, Preusker, Frank, Sabau, Lola, Scholten, Frank, Snodgrass, Colin, Thomas, Nicolas, Tubiana, Cecilia, Vincent, Jean-Baptiste, Wenzel, Klaus-Peter, Zaccariotto, Mirco, Paetzold, Martin, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe L., Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Angrilli, Francesco, Auger, Anne-Therese, Barucci, M. Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Besse, Sebastien, Bodewits, Dennis, Capanna, Claire, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Bjoern, Debei, Stefano, De Cecco, Mariolino, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Gaskell, Robert, Giacomini, Lorenza, Groussin, Olivier, Gutierrez-Marques, Pablo, Gutiuerrez, Pedro J., Guettler, Carsten, Hoekzema, Nick, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kovacs, Gabor, Kramm, J. Rainer, Kuehrt, Ekkehard, Kueppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Leyrat, Cedric, Moreno, Jose J. Lopez, Magrin, Sara, Marchi, Simone, Marzari, Francesco, Massironi, Matteo, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Pajola, Maurizio, Pertile, Marco, Preusker, Frank, Sabau, Lola, Scholten, Frank, Snodgrass, Colin, Thomas, Nicolas, Tubiana, Cecilia, Vincent, Jean-Baptiste, Wenzel, Klaus-Peter, Zaccariotto, Mirco, and Paetzold, Martin
Abstract: Images from the OSIRIS scientific imaging system onboard Rosetta show that the nucleus of 67P/Churyumov-Gerasimenko consists of two lobes connected by a short neck. The nucleus has a bulk density less than half that of water. Activity at a distance from the Sun of >3 astronomical units is predominantly from the neck, where jets have been seen consistently. The nucleus rotates about the principal axis of momentum. The surface morphology suggests that the removal of larger volumes of material, possibly via explosive release of subsurface pressure or via creation of overhangs by sublimation, may be a major mass loss process. The shape raises the question of whether the two lobes represent a contact binary formed 4.5 billion years ago, or a single body where a gap has evolved via mass loss.
Published: 2015
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23. The morphological diversity of comet 67P/Churyumov-Gerasimenko

Author: Thomas, Nicolas, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe L., Rodrigo, Rafael, Rickman, Hans, Koschny, Detlef, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Angrilli, Francesco, Auger, Anne-Therese, Barucci, M. Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Besse, Sebastien, Bodewits, Dennis, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, De Cecco, Mariolino, Debei, Stefano, El-Maarry, Mohamed Ramy, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Giacomini, Lorenza, Groussin, Olivier, Gutierrez, Pedro J., Guettler, Carsten, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kuehrt, Ekkehard, Kueppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Moreno, Jose J. Lopez, Magrin, Sara, Marchi, Simone, Marzari, Francesco, Massironi, Matteo, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Pajola, Maurizio, Pommerol, Antoine, Preusker, Frank, Sabau, Lola, Scholten, Frank, Snodgrass, Colin, Tubiana, Cecilia, Vincent, Jean-Baptiste, Wenzel, Klaus-Peter, Thomas, Nicolas, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe L., Rodrigo, Rafael, Rickman, Hans, Koschny, Detlef, Keller, Horst Uwe, Agarwal, Jessica, A'Hearn, Michael F., Angrilli, Francesco, Auger, Anne-Therese, Barucci, M. Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Besse, Sebastien, Bodewits, Dennis, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, De Cecco, Mariolino, Debei, Stefano, El-Maarry, Mohamed Ramy, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Giacomini, Lorenza, Groussin, Olivier, Gutierrez, Pedro J., Guettler, Carsten, Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kuehrt, Ekkehard, Kueppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Moreno, Jose J. Lopez, Magrin, Sara, Marchi, Simone, Marzari, Francesco, Massironi, Matteo, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Pajola, Maurizio, Pommerol, Antoine, Preusker, Frank, Sabau, Lola, Scholten, Frank, Snodgrass, Colin, Tubiana, Cecilia, Vincent, Jean-Baptiste, and Wenzel, Klaus-Peter
Abstract: Images of comet 67P/Churyumov-Gerasimenko acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) imaging system onboard the European Space Agency's Rosetta spacecraft at scales of better than 0.8 meter per pixel show a wide variety of different structures and textures. The data show the importance of airfall, surface dust transport, mass wasting, and insolation weathering for cometary surface evolution, and they offer some support for subsurface fluidization models and mass loss through the ejection of large chunks of material.
Published: 2015
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24. Size-frequency distribution of boulders >= 7 m on comet 67P/Churyumov-Gerasimenko

Author: Pajola, Maurizio, Vincent, Jean-Baptiste, Guettler, Carsten, Lee, Jui-Chi, Bertini, Ivano, Massironi, Matteo, Simioni, Emanuele, Marzari, Francesco, Giacomini, Lorenza, Lucchetti, Alice, Barbieri, Cesare, Cremonese, Gabriele, Naletto, Giampiero, Pommerol, Antoine, El-Maarry, Mohamed R., Besse, Sebastien, Kueppers, Michael, La Forgia, Fiorangela, Lazzarin, Monica, Thomas, Nicholas, Auger, Anne-Therese, Sierks, Holger, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst U., Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria A., Bertaux, Jean-Loup, Da Deppo, Vania, Davidsson, Björn, De Cecco, Mariolino, Debei, Stefano, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kuert, Ekkehard, Lara, Luisa M., Lin, Zhong-Yi, Lopez Moreno, Jose J., Magrin, Sara, Marchi, Simone, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Oklay, Nilda, Preusker, Frank, Scholten, Frank, Tubiana, Cecilia, Pajola, Maurizio, Vincent, Jean-Baptiste, Guettler, Carsten, Lee, Jui-Chi, Bertini, Ivano, Massironi, Matteo, Simioni, Emanuele, Marzari, Francesco, Giacomini, Lorenza, Lucchetti, Alice, Barbieri, Cesare, Cremonese, Gabriele, Naletto, Giampiero, Pommerol, Antoine, El-Maarry, Mohamed R., Besse, Sebastien, Kueppers, Michael, La Forgia, Fiorangela, Lazzarin, Monica, Thomas, Nicholas, Auger, Anne-Therese, Sierks, Holger, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Keller, Horst U., Agarwal, Jessica, A'Hearn, Michael F., Barucci, Maria A., Bertaux, Jean-Loup, Da Deppo, Vania, Davidsson, Björn, De Cecco, Mariolino, Debei, Stefano, Ferri, Francesca, Fornasier, Sonia, Fulle, Marco, Groussin, Olivier, Gutierrez, Pedro J., Hviid, Stubbe F., Ip, Wing-Huen, Jorda, Laurent, Knollenberg, Joerg, Kramm, J. -Rainer, Kuert, Ekkehard, Lara, Luisa M., Lin, Zhong-Yi, Lopez Moreno, Jose J., Magrin, Sara, Marchi, Simone, Michalik, Harald, Moissl, Richard, Mottola, Stefano, Oklay, Nilda, Preusker, Frank, Scholten, Frank, and Tubiana, Cecilia
Abstract: Aims. We derive for the first time the size-frequency distribution of boulders on a comet, 67P/Churyumov-Gerasimenko (67P), computed from the images taken by the Rosetta/OSIRIS imaging system. We highlight the possible physical processes that lead to these boulder size distributions. Methods. We used images acquired by the OSIRIS Narrow Angle Camera, NAC. on 5 and 6 August 2014. The scale of these images (2.44-2.03 m/px) is such that boulders >= 7 m can be identified and manually extracted from the datasets with the software ArcGIS. We derived both global and localized size-frequency distributions. The three-pixel sampling detection, coupled with the favorable shadowine of the surface (observation phase angle ranging from 48 to 53), enables unequivocally detecting boulders scattered all over the illuminated side of 67P. Results. We identify 3546 boulders larger than 7 m on the imaged surface (36.4 km(2)), with a global number density of nearly 100/km(2) and a cumulative size-frequency distribution represented by a power-law with index of -3.6 +0.2/-0.3. The two lobes of 67P appear to have slightly different distributions, with an index of -3.5 +0.2/-0.3 for the main lobe (body) and -4.0 +0.31-0.2 for the small lobe (head). The steeper distribution of the small lobe might be due to a more pervasive fracturing. The difference of the distribution for the connecting region (neck) is much more significant, with an index value of -2.2 +0.2/-0.2. We propose that the boulder field located in the neck area is the result of blocks falling from the contiguous Hathor cliff. The lower slope of the size-frequency distribution we see today in the neck area might be due to the concurrent processes acting on the smallest boulders, such as i) disintegration or fragmentation and vanishing through sublimation; ii) uplifting by gas drag and consequent redistribution; and iii) burial beneath a debris blanket. We also derived the cumulative size-frequency distribution per km(2) of loca
Published: 2015
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25. Size-frequency distribution of boulders ≥7 m on comet 67P/Churyumov-Gerasimenko

Author: Pajola, Maurizio, primary, Vincent, Jean-Baptiste, additional, Güttler, Carsten, additional, Lee, Jui-Chi, additional, Bertini, Ivano, additional, Massironi, Matteo, additional, Simioni, Emanuele, additional, Marzari, Francesco, additional, Giacomini, Lorenza, additional, Lucchetti, Alice, additional, Barbieri, Cesare, additional, Cremonese, Gabriele, additional, Naletto, Giampiero, additional, Pommerol, Antoine, additional, El-Maarry, Mohamed R., additional, Besse, Sébastien, additional, Küppers, Michael, additional, La Forgia, Fiorangela, additional, Lazzarin, Monica, additional, Thomas, Nicholas, additional, Auger, Anne-Thérèse, additional, Sierks, Holger, additional, Lamy, Philippe, additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst U., additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Barucci, Maria A., additional, Bertaux, Jean-Loup, additional, Deppo, Vania Da, additional, Davidsson, Björn, additional, De Cecco, Mariolino, additional, Debei, Stefano, additional, Ferri, Francesca, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Groussin, Olivier, additional, Gutierrez, Pedro J., additional, Hviid, Stubbe F., additional, Ip, Wing-Huen, additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kramm, J.-Rainer, additional, Kürt, Ekkehard, additional, Lara, Luisa M., additional, Lin, Zhong-Yi, additional, Moreno, Jose J. Lopez, additional, Magrin, Sara, additional, Marchi, Simone, additional, Michalik, Harald, additional, Moissl, Richard, additional, Mottola, Stefano, additional, Oklay, Nilda, additional, Preusker, Frank, additional, Scholten, Frank, additional, and Tubiana, Cecilia, additional
Published: 2015
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26. Exploring Potential Surface Heterogeneity of the Asteroid Steins observed from the Rosetta OSIRIS Instrument

Author: Leyrat, Cédric, Jorda, Laurent, Fornasier, Sonia, Fulchignoni, Marcello, Barucci, Maria Antonella, Belskaya, Irina, Lamy, Philippe, Groussin, Olivier, Charnoz, Sébastien, Keller, H., Sierks, Holger, Hviid, Stubbe F., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2009

27. Spatial Variations of Spectral Properties of (21) Lutetia as Observed by OSIRIS/Rosetta

Author: Leyrat, Cédric, Sierks, Holger, Barbieri, Cesare, Barucci, Maria Antonella, da Deppo, Vania, de Léon, J., Fulchignoni, Marcello, Fornasier, Sonia, Groussin, Olivier, Hviid, Stubbe F., Jorda, Laurent, Keller, Horst Uwe, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Magrin, Sara, Marchi, Simone, Thomas, Nicholas, Schröder, S. E., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2008

28. Overview of the Rosetta Fly-by of 21-Lutetia as Observed by the OSIRIS Camera System

Author: Hviid, Stubbe F., Barbieri, Cesare, Barucci, Maria Antonella, Bertini, Ivano, Baglivo, L., Besse, Sébastien, da Deppo, Vania, Debei, Stefano, de Cecco, M., Ferri, Francesca, Fornasier, Sonia, Groussin, Olivier, Gutierrez, Pedro J., Jorda, Laurent, Keller, Horst Uwe, Küppers, Michael, Leyrat, Cédric, Lara, Luisa M., Lazzarin, Monica, de Léon, J., Magrin, Sara, Marchi, Simone, Massironi, Matteo, Moissl, Richard, Sabolo, W., Schröder, S. E., Pertile, Marco, Sierks, Holger, Snodgrass, Colin, Thomas, Nicholas, Tubiana, Cecilia, Vincent, Jean-Baptiste, Vernazza, Pierre, Zaccariotto, Mirco, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2008

29. Rosetta Fly-by of Asteroid 2867 Steins: Phase Function from the OSIRIS Imaging System

Author: Hviid, Stubbe F., Fornasier, Sonia, Vernazza, Pierre, Sierks, Holger, Keller, Horst Uwe, Sabolo, W., Küppers, Michael, Ferri, Francesca, da Deppo, Vania, Barbieri, Cesare, Lamy, Philippe, Jorda, Laurent, Groussin, Olivier, Koschny, Detlef, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2008

30. Surface Physical Properties of (21) Lutetia: Results from OSIRIS Observations During the Rosetta Fly-by

Author: Fornasier, Sonia, Barbieri, Cesare, Barucci, Maria Antonella, da Deppo, Vania, de Léon, J., Fulchignoni, Marcello, Hviid, Stubbe F., Jorda, Laurent, Keller, Horst Uwe, Küppers, Michael, La Forgia, Fiorangela, Lara, Luisa M., Lazzarin, Monica, Leyrat, Cédric, Magrin, Sara, Marchi, Simone, Schröder, S. E., Sierks, Holger, Vernazza, Pierre, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2008

31. OSIRIS Observations of Asteroid 21 Lutetia: Geomorphology and Colour Variegation

Author: Keller, Horst Uwe, Schröder, S. E., Hviid, Stubbe F., Spjuth, S., Jorda, Laurent, Groussin, Olivier, Thomas, Nicholas, Barucci, Maria Antonella, Fornasier, Sonia, Leyrat, Cédric, Besse, Sébastien, da Deppo, Vania, Debei, Stefano, Ferri, Francesca, Marchi, Simone, Moissl, Richard, Tubiana, Cecilia, Vincent, Jean-Baptiste, Lara, Luisa M., de Léon, J., Küppers, Michael, Magrin, Sara, Lazzarin, Monica, Vernazza, Pierre, Barbieri, Cesare, Sierks, Holger, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2008

32. The Light Curve Of The Dust Cloud Ejected By The Collision Between The Deep Impact Projectile And The Nucleus Of Comet 9P/Tempel 1

Author: Küppers, Michael, Rengel, Miriam, Keller, H.U., Gutiérrez, Pedro J., and Hviid, Stubbe F.
Subjects: Projectile impact, Light curve, Astrophysics, Velocity distribution, Comet 9P/Tempel 1, Dust cloud, Rosetta spacecraft, Physics::Space Physics, Narrow Angle Camera (NAC), Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, OSIRIS, Deep Impact spacecraft, Astrophysics::Galaxy Astrophysics
Abstract: Contribution presented at the 39th Annual Meeting of the Division for Planetary Sciences of the American Astronomical Association (DPS 2007), October 7-12, 2007 Orlando, Florida., When Deep Impact fired its projectile into the nucleus of comet 9P/Tempel 1, a cloud made of dust and icy grains was ejected from the impact crater. The dust was subsequently accelerated by gas drag. About a week after the impact event, the dust cloud has dispersed due to its expansion and the force exerted by solar radiation pressure. The light curve of the dust cloud contains information about its formation and evolution: the time scale of the production of impact created material can be derived from the time scale of the brightness increase. The velocity distribution of the cloud is indicative of acceleration processes in the inner coma of the comet. Finally, the abundance of large dust particles created by the impact can be estimated from the brightness of the cloud several days after the impact when small particles have been pushed away by radiation pressure., Here we analyze data obtained by the Narrow Angle Camera (NAC) of OSIRIS onboard the ESA spacecraft Rosetta to derive the velocity distribution of the dust cloud from an inversion of its light curve. OSIRIS observed comet Tempel 1 near-continuously for more than two weeks around the impact. A model of the expansion of the ejecta is compared to the light curve seen by the NAC. We derive a broad velocity distribution of the dust particles, which peaks at around 225 m/s, in good agreement with published estimates. The velocity suggest that the impact ejecta were quickly accelerated by gas in the cometary coma. We will discuss implications of our results for the evolution of the dust cloud during the first hours after the impact and provide estimates of the released dust mass., We acknowledge the funding of the agencies ASI, CNES, DLR, the Spanish Space Program (Ministerio de Educación y Ciencia), SNSB and ESA.
Published: 2007

33. Observations of Comet 9P/Tempel 1 around the Deep Impact event by the OSIRIS cameras onboard Rosetta

Author: HORST UWE KELLER, Michael, Kppers, Sonia, Fornasier, Gutierrez, PEDRO J., Hviid, STUBBE F., Laurent, Jorda, Jrg, Knollenberg, Lowry, STEPHEN C., Miriam, Rengel, Bertini, Ivano, Gabriele, Cremonese, WING H., Ip, Detlef, Koschny, Rainer, Kramm, Ekkehard, Khrt, Luisa, Maria, Lara, Holger, Sierks, Nicolas, Thomas, Barbieri, Cesare, Philippe, Lamy, Hans, Rickman, Rafael, Rodrigo, Ahearn, MICHAEL F., Francesco, Angrilli, MARIA ANTONELLA BARUCCI, Jean, Loup, Bertaux, VANIA DA DEPPO, Davidsson, BJRN J. R., MARIOLINO DE CECCO, Debei, Stefano, Marco, Fulle, Fritz, Gliem, Olivier, Groussin, LOPEZ MORENO, JOS J., Marzari, Francesco, Naletto, Giampiero, Lola, Sabau, ANGEL SANZ ANDRS, KLAUS PETER WENZEL, Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Max-Planck-Gesellschaft, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Centro di Ateneo di Studi e Attività Spaziali 'Giuseppe Colombo' (CISAS), Università degli Studi di Padova = University of Padua (Unipd), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), DLR Institut für Planetenforschung, Deutsches Zentrum für Luft- und Raumfahrt [Berlin] (DLR), Astrophysics Research Centre [Belfast] (ARC), Queen's University [Belfast] (QUB), INAF - Osservatorio Astronomico di Padova (OAPD), Istituto Nazionale di Astrofisica (INAF), Institute of Space Science [Taiwan], National Central University [Taiwan] (NCU), European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), Physikalisches Institut [Bern], Universität Bern [Bern] (UNIBE), Department of Astronomy and Space Physics [Uppsala], Uppsala University, Department of Astronomy [College Park], University of Maryland [College Park], University of Maryland System-University of Maryland System, Dipartimento di Ingegneria Meccanica [Padova], Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Padova] (DEI), Università degli Studi di Trento (UNITN), INAF - Osservatorio Astronomico di Trieste (OAT), Institut für Datentechnik und Kommunikationsnetze, Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Dipartimento di Fisica e Astronomia 'Galileo Galilei', Instituto Nacional de Técnica Aeroespacial (INTA), Instituto de Microgravedad 'Ignacio Da Riva', and Universidad Politécnica de Madrid (UPM)
Subjects: Solar System, 010504 meteorology & atmospheric sciences, TELESCOPE, Comet, Narrow angle, coma, impact processes, surfaces, Osiris, 01 natural sciences, Aeronáutica, Comet Tempel-1, Comets, Impact processes, 0103 physical sciences, comets, RATES, Comets, coma, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Physics, COMET-9P/TEMPEL-1, biology, Spacecraft, business.industry, Astronomy, Astronomy and Astrophysics, biology.organism_classification, Light curve, Astronomía, DUST ENVIRONMENT, [SDU]Sciences of the Universe [physics], 13. Climate action, Space and Planetary Science, dust, ATMOSPHERES, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: 17 pp.-- Final full-text version of the paper available at: http://dx.doi.org/10.1016/j.icarus.2006.09.023., The OSIRIS cameras on the Rosetta spacecraft observed Comet 9P/Tempel 1 from 5 days before to 10 days after it was hit by the Deep Impact projectile. The Narrow Angle Camera (NAC) monitored the cometary dust in 5 different filters. The Wide Angle Camera (WAC) observed through filters sensitive to emissions from OH, CN, Na, and OI together with the associated continuum. Before and after the impact the comet showed regular variations in intensity. The period of the brightness changes is consistent with the rotation period of Tempel 1. The overall brightness of Tempel 1 decreased by about 10% during the OSIRIS observations. The analysis of the impact ejecta shows that no new permanent coma structures were created by the impact. Most of the material moved with ~ 200 m/s. Much of it left the comet in the form of icy grains which sublimated and fragmented within the first hour after the impact. The light curve of the comet after the impact and the amount of material leaving the comet (4.5 - 9 x 10e6 of water ice and a presumably larger amount of dust) suggest that the impact ejecta were quickly accelerated by collisions with gas molecules. Therefore, the motion of the bulk of the ejecta cannot be described by ballistic trajectories, and the validity of determinations of the density and tensile strength of the nucleus of Tempel 1 with models using ballistic ejection of particles is uncertain., The OSIRIS imaging system on board Rosetta is managed by the Max-Planck-Institute for Solar System Research in Katlenburg-Lindau (Germany), thanks to an International collaboration between Germany, France, Italy, Spain, and Sweden. We acknowledge the funding of the national space agencies ASI, CNES, DLR, the Spanish Space Program (Ministerio de Educacion y Ciencia), SNSB and ESA. IRAF is distributed by the National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation. We acknowledge JPL's Horizons online ephemeris generator for providing the comet's position and rate of motion during the observations. This research has made use of NASA's Astrophysics Data System.
Published: 2007
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34. Determination Of The Light Curve Of Rosetta Target Asteroid 2867 Steins With The Osiris Narrow Angle Camera Onboard Rosetta

Author: Küppers, Michael, Keller, Horst Uwe, Hviid, Stubbe F., Mottola, Stefano, Fornasier, Sonia, Barbieri, Cesare, Barucci, Maria Antonella, Gutiérrez, P., Lamy, Philippe, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: Rosetta, Lightcurves, 2867 Steins, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Osiris, Asteroids
Abstract: International audience
Published: 2006

35. Properties of the DEEP IMPACT Dust Cloud

Author: Jorda, Laurent, Lamy, Philippe, Faury, G., Keller, Horst Uwe, Küppers, Michael, Hviid, Stubbe F., Koschny, Detlef, Lecacheux, Jean, Gutierrez, Pedro J., Lara, Luisa M., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2006

36. Evidence for a Large Dust/Ice Ratio in the Nucleus of Comet 9P/Tempel 1

Author: Küppers, Michael, Bertini, Ivano, Fornasier, Sonia, Gutierrez, Pedro J., Hviid, Stubbe F., Jorda, Laurent, Keller, Horst Uwe, Knollenberg, Jörg, Koschny, Detlef, Kramm, Rainer, Lara, Luisa-Maria, Sierks, Holger, Thomas, Nicolas, Barbieri, Cesare, Lamy, Philippe, Rickman, Hans, Rodrigo, Rafael, A'Hearn, M. F., Angrilli, F., Bailey, M. E., Barthol, P., Barucci, M. A., Bertaux, J.-L., Burns, J. A., Cremonese, G., Curdt, W., De Cecco, M., Debei, S., Fulle, M., Gliem, F., Ip, W.-H., Kührt, E., Llebaria, A., Lopez Moreno, J. J., Marzari, F., Naletto, G., Sabau, L., Sanz Andrés, A., Sivan, J. P., Tondello, G., and Wenzel, K.-P.
Subjects: Deep Impact, dust/ice ratio, comets
Published: 2005

37. Combined Visible Observations Of Comet 9P/Tempel 1 During The Deep Impact Event From Pic du Midi Observatory And With The ROSETTA/OSIRIS Narrow Angle Camera

Author: Jorda, Laurent, Lamy, Philippe, Faury, G., Gutierrez, Pedro J., Keller, Horst Uwe, Küppers, Michael, Lecacheux, Jean, Colas, François, Hviid, Stubbe F., Lara, Luisa M., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience
Published: 2005

38. The morphological diversity of comet 67P/Churyumov-Gerasimenko

Author: Thomas, Nicolas, primary, Sierks, Holger, additional, Barbieri, Cesare, additional, Lamy, Philippe L., additional, Rodrigo, Rafael, additional, Rickman, Hans, additional, Koschny, Detlef, additional, Keller, Horst Uwe, additional, Agarwal, Jessica, additional, A'Hearn, Michael F., additional, Angrilli, Francesco, additional, Auger, Anne-Therese, additional, Barucci, M. Antonella, additional, Bertaux, Jean-Loup, additional, Bertini, Ivano, additional, Besse, Sebastien, additional, Bodewits, Dennis, additional, Cremonese, Gabriele, additional, Da Deppo, Vania, additional, Davidsson, Björn, additional, De Cecco, Mariolino, additional, Debei, Stefano, additional, El-Maarry, Mohamed Ramy, additional, Ferri, Francesca, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Giacomini, Lorenza, additional, Groussin, Olivier, additional, Gutierrez, Pedro J., additional, Güttler, Carsten, additional, Hviid, Stubbe F., additional, Ip, Wing-Huen, additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kramm, J.-Rainer, additional, Kührt, Ekkehard, additional, Küppers, Michael, additional, La Forgia, Fiorangela, additional, Lara, Luisa M., additional, Lazzarin, Monica, additional, Moreno, Josè J. Lopez, additional, Magrin, Sara, additional, Marchi, Simone, additional, Marzari, Francesco, additional, Massironi, Matteo, additional, Michalik, Harald, additional, Moissl, Richard, additional, Mottola, Stefano, additional, Naletto, Giampiero, additional, Oklay, Nilda, additional, Pajola, Maurizio, additional, Pommerol, Antoine, additional, Preusker, Frank, additional, Sabau, Lola, additional, Scholten, Frank, additional, Snodgrass, Colin, additional, Tubiana, Cecilia, additional, Vincent, Jean-Baptiste, additional, and Wenzel, Klaus-Peter, additional
Published: 2015
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39. On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko

Author: Sierks, Holger, primary, Barbieri, Cesare, additional, Lamy, Philippe L., additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst Uwe, additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Angrilli, Francesco, additional, Auger, Anne-Therese, additional, Barucci, M. Antonella, additional, Bertaux, Jean-Loup, additional, Bertini, Ivano, additional, Besse, Sebastien, additional, Bodewits, Dennis, additional, Capanna, Claire, additional, Cremonese, Gabriele, additional, Da Deppo, Vania, additional, Davidsson, Björn, additional, Debei, Stefano, additional, De Cecco, Mariolino, additional, Ferri, Francesca, additional, Fornasier, Sonia, additional, Fulle, Marco, additional, Gaskell, Robert, additional, Giacomini, Lorenza, additional, Groussin, Olivier, additional, Gutierrez-Marques, Pablo, additional, Gutiérrez, Pedro J., additional, Güttler, Carsten, additional, Hoekzema, Nick, additional, Hviid, Stubbe F., additional, Ip, Wing-Huen, additional, Jorda, Laurent, additional, Knollenberg, Jörg, additional, Kovacs, Gabor, additional, Kramm, J. Rainer, additional, Kührt, Ekkehard, additional, Küppers, Michael, additional, La Forgia, Fiorangela, additional, Lara, Luisa M., additional, Lazzarin, Monica, additional, Leyrat, Cédric, additional, Lopez Moreno, Josè J., additional, Magrin, Sara, additional, Marchi, Simone, additional, Marzari, Francesco, additional, Massironi, Matteo, additional, Michalik, Harald, additional, Moissl, Richard, additional, Mottola, Stefano, additional, Naletto, Giampiero, additional, Oklay, Nilda, additional, Pajola, Maurizio, additional, Pertile, Marco, additional, Preusker, Frank, additional, Sabau, Lola, additional, Scholten, Frank, additional, Snodgrass, Colin, additional, Thomas, Nicolas, additional, Tubiana, Cecilia, additional, Vincent, Jean-Baptiste, additional, Wenzel, Klaus-Peter, additional, Zaccariotto, Mirco, additional, and Pätzold, Martin, additional
Published: 2015
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40. Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun

Author: Rotundi, Alessandra, primary, Sierks, Holger, additional, Della Corte, Vincenzo, additional, Fulle, Marco, additional, Gutierrez, Pedro J., additional, Lara, Luisa, additional, Barbieri, Cesare, additional, Lamy, Philippe L., additional, Rodrigo, Rafael, additional, Koschny, Detlef, additional, Rickman, Hans, additional, Keller, Horst Uwe, additional, López-Moreno, José J., additional, Accolla, Mario, additional, Agarwal, Jessica, additional, A’Hearn, Michael F., additional, Altobelli, Nicolas, additional, Angrilli, Francesco, additional, Barucci, M. Antonietta, additional, Bertaux, Jean-Loup, additional, Bertini, Ivano, additional, Bodewits, Dennis, additional, Bussoletti, Ezio, additional, Colangeli, Luigi, additional, Cosi, Massimo, additional, Cremonese, Gabriele, additional, Crifo, Jean-Francois, additional, Da Deppo, Vania, additional, Davidsson, Björn, additional, Debei, Stefano, additional, De Cecco, Mariolino, additional, Esposito, Francesca, additional, Ferrari, Marco, additional, Fornasier, Sonia, additional, Giovane, Frank, additional, Gustafson, Bo, additional, Green, Simon F., additional, Groussin, Olivier, additional, Grün, Eberhard, additional, Güttler, Carsten, additional, Herranz, Miguel L., additional, Hviid, Stubbe F., additional, Ip, Wing, additional, Ivanovski, Stavro, additional, Jerónimo, José M., additional, Jorda, Laurent, additional, Knollenberg, Joerg, additional, Kramm, Rainer, additional, Kührt, Ekkehard, additional, Küppers, Michael, additional, Lazzarin, Monica, additional, Leese, Mark R., additional, López-Jiménez, Antonio C., additional, Lucarelli, Francesca, additional, Lowry, Stephen C., additional, Marzari, Francesco, additional, Epifani, Elena Mazzotta, additional, McDonnell, J. Anthony M., additional, Mennella, Vito, additional, Michalik, Harald, additional, Molina, Antonio, additional, Morales, Rafael, additional, Moreno, Fernando, additional, Mottola, Stefano, additional, Naletto, Giampiero, additional, Oklay, Nilda, additional, Ortiz, José L., additional, Palomba, Ernesto, additional, Palumbo, Pasquale, additional, Perrin, Jean-Marie, additional, Rodríguez, Julio, additional, Sabau, Lola, additional, Snodgrass, Colin, additional, Sordini, Roberto, additional, Thomas, Nicolas, additional, Tubiana, Cecilia, additional, Vincent, Jean-Baptiste, additional, Weissman, Paul, additional, Wenzel, Klaus-Peter, additional, Zakharov, Vladimir, additional, and Zarnecki, John C., additional
Published: 2015
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41. E-Type Asteroid (2867) Steins as Imaged by OSIRIS on Board Rosetta

Author: Keller, H.U., Barbieri, Cesare, Koschny, Detlef, Lamy, Philoppe, Rickman, Hans, Rodrigo Montero, Rafael, Sierks, Holger, A’Hearn, Michael F., Angrilli, Francesco, Barucci, M.A., Bertaux, Jean-Loup, Cremonese, G., Deppo, Vania da, Davidsson, B., Cecco, Mariolino de, Debei, Stefano, Fornasier, S., Fulle, Marco, Groussin, Olivier, Gutiérrez, Pedro J., Hviid, Stubbe F., Ip, W., Jorda, Laurent, Knollenberg, Jörg, Kramm, Rainer, Kührt, E., Küppers, Michael, Lara, Luisa María, Lazzarin, Mónica, López-Moreno, José Juan, Marzari, Francesco, Michalik, Harald, Naletto, Giampiero, Sabau-Graziati, Lola, Thomas, Nicolas, Wenzel, Klaus-Peter, Bertini, Ivano, Besse, S., Ferri, Francesca, Kaasalainen, Mikko, Lowry, Stephen C., Marchi, Simone, Mottola, Stefano, Sabolo, Walter, Schröder, Stefan E., Spjuth, S., Vernazza, Pierre, Keller, H.U., Barbieri, Cesare, Koschny, Detlef, Lamy, Philoppe, Rickman, Hans, Rodrigo Montero, Rafael, Sierks, Holger, A’Hearn, Michael F., Angrilli, Francesco, Barucci, M.A., Bertaux, Jean-Loup, Cremonese, G., Deppo, Vania da, Davidsson, B., Cecco, Mariolino de, Debei, Stefano, Fornasier, S., Fulle, Marco, Groussin, Olivier, Gutiérrez, Pedro J., Hviid, Stubbe F., Ip, W., Jorda, Laurent, Knollenberg, Jörg, Kramm, Rainer, Kührt, E., Küppers, Michael, Lara, Luisa María, Lazzarin, Mónica, López-Moreno, José Juan, Marzari, Francesco, Michalik, Harald, Naletto, Giampiero, Sabau-Graziati, Lola, Thomas, Nicolas, Wenzel, Klaus-Peter, Bertini, Ivano, Besse, S., Ferri, Francesca, Kaasalainen, Mikko, Lowry, Stephen C., Marchi, Simone, Mottola, Stefano, Sabolo, Walter, Schröder, Stefan E., Spjuth, S., and Vernazza, Pierre
Abstract: The European Space Agency’s Rosetta mission encountered the main-belt asteroid (2867) Steins while on its way to rendezvous with comet 67P/Churyumov-Gerasimenko. Images taken with the OSIRIS (optical, spectroscopic, and infrared remote imaging system) cameras on board Rosetta show that Steins is an oblate body with an effective spherical diameter of 5.3 kilometers. Its surface does not show color variations. The morphology of Steins is dominated by linear faults and a large 2.1-kilometer-diameter crater near its south pole. Crater counts reveal a distinct lack of small craters. Steins is not solid rock but a rubble pile and has a conical appearance that is probably the result of reshaping due to Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) spin-up. The OSIRIS images constitute direct evidence for the YORP effect on a main-belt asteroid.
Published: 2010

42. Observations of Comet 9P/Tempel 1 around the Deep Impact event by the OSIRIS cameras onboard Rosetta

Author: Keller, H.U., Küppers, Michael, Fornasier, S., Gutiérrez, Pedro J., Hviid, Stubbe F., Jorda, Laurent, Knollenberg, Jörg, Lowry, Stephen C., Rengel, Miriam, Bertini, Ivano, Cremonese, G., Wing, Ip, Koschny, Detlef, Kramm, Rainer, Kührt, E., Lara, Luisa María, Sierks, Holger, Thomas, Nicolas, Barbieri, Cesare, Lamy, Philoppe, Rickman, Hans, Rodrigo Montero, Rafael, A’Hearn, Michael F., Angrilli, Francesco, Barucci, M.A., Bertaux, Jean-Loup, Deppo, Vania da, Davidsson, B., Cecco, Mariolino de, Debei, Stefano, Fulle, Marco, Gliem, Fritz, Groussin, Olivier, López-Moreno, José Juan, Marzari, Francesco, Naletto, Giampiero, Sabau-Graziati, Lola, Sanz Andrés, Ángel, Wenzel, Klaus-Peter, Keller, H.U., Küppers, Michael, Fornasier, S., Gutiérrez, Pedro J., Hviid, Stubbe F., Jorda, Laurent, Knollenberg, Jörg, Lowry, Stephen C., Rengel, Miriam, Bertini, Ivano, Cremonese, G., Wing, Ip, Koschny, Detlef, Kramm, Rainer, Kührt, E., Lara, Luisa María, Sierks, Holger, Thomas, Nicolas, Barbieri, Cesare, Lamy, Philoppe, Rickman, Hans, Rodrigo Montero, Rafael, A’Hearn, Michael F., Angrilli, Francesco, Barucci, M.A., Bertaux, Jean-Loup, Deppo, Vania da, Davidsson, B., Cecco, Mariolino de, Debei, Stefano, Fulle, Marco, Gliem, Fritz, Groussin, Olivier, López-Moreno, José Juan, Marzari, Francesco, Naletto, Giampiero, Sabau-Graziati, Lola, Sanz Andrés, Ángel, and Wenzel, Klaus-Peter
Abstract: The OSIRIS cameras on the Rosetta spacecraft observed Comet 9P/Tempel 1 from 5 days before to 10 days after it was hit by the Deep Impact projectile. The Narrow Angle Camera (NAC) monitored the cometary dust in 5 different filters. The Wide Angle Camera (WAC) observed through filters sensitive to emissions from OH, CN, Na, and OI together with the associated continuum. Before and after the impact the comet showed regular variations in intensity. The period of the brightness changes is consistent with the rotation period of Tempel 1. The overall brightness of Tempel 1 decreased by about 10% during the OSIRIS observations. The analysis of the impact ejecta shows that no new permanent coma structures were created by the impact. Most of the material moved with ~ 200 m/s. Much of it left the comet in the form of icy grains which sublimated and fragmented within the first hour after the impact. The light curve of the comet after the impact and the amount of material leaving the comet (4.5 - 9 x 10e6 of water ice and a presumably larger amount of dust) suggest that the impact ejecta were quickly accelerated by collisions with gas molecules. Therefore, the motion of the bulk of the ejecta cannot be described by ballistic trajectories, and the validity of determinations of the density and tensile strength of the nucleus of Tempel 1 with models using ballistic ejection of particles is uncertain.
Published: 2007

43. Determination of the light curve of the Rosetta target asteroid (2867) Steins by the OSIRIS cameras onboard Rosetta

Author: Küppers, Michael, Mottola, Stefano, Lowry, Stephen C., A’Hearn, Michael F., Barbieri, Cesare, Barucci, M.A., Fornasier, S., Groussin, Olivier, Gutiérrez, Pedro J., Hviid, Stubbe F., Keller, H.U., Lamy, Philoppe, Küppers, Michael, Mottola, Stefano, Lowry, Stephen C., A’Hearn, Michael F., Barbieri, Cesare, Barucci, M.A., Fornasier, S., Groussin, Olivier, Gutiérrez, Pedro J., Hviid, Stubbe F., Keller, H.U., and Lamy, Philoppe
Abstract: [Context] In 2004 asteroid (2867) Steins has been selected as a flyby target for the Rosetta mission. Determination of its spin period and the orientation of its rotation axis are essential for optimization of the flyby planning., [Aims] Measurement of the rotation period and light curve of asteroid (2867) Steins at a phase angle larger than achievable from ground based observations, providing a high quality data set to contribute to the determination of the orientation of the spin axis and of the pole direction., [Methods] On March 11, 2006, asteroid (2867) Steins was observed continuously for 24 h with the scientific camera system OSIRIS onboard Rosetta. The phase angle was 41.7 degrees, larger than the maximum phase angle of 30 degrees when Steins is observed from Earth. A total of 238 images, covering four rotation periods without interruption, were acquired., [Results] The light curve of (2867) Steins is double peaked with an amplitude of ≈0.23 mag. The rotation period is 6.052 ± 0.007 h. The continuous observations over four rotation periods exclude the possibility of period ambiguities. There is no indication of deviation from a principal axis rotation state. Assuming a slope parameter of G = 0.15, the absolute visual magnitude of Steins is 13.05 ± 0.03.
Published: 2007

44. Indication of drier periode on Mars from the chemistry and mineralogy of atmospheric dust

Author: Walter, Goetz, Bertelsen, Preben, Madsen, Daniel, Madsen, M.B., Olsen, M., Schröder, C, Gunnlaugsson, Haraldur P., Hviid, Stubbe F., Kinch, Kjartan M., Gellert, Ralf, Klingelhöfer, Göster, Ming, Douglas W., Morris, Richard V., Rudolf, Rieder, Rodionov, Daniel S., de Souza Jr, Paulo A., Squyres, Steve W., Wdowiak, Tom, Yen, Albert, Walter, Goetz, Bertelsen, Preben, Madsen, Daniel, Madsen, M.B., Olsen, M., Schröder, C, Gunnlaugsson, Haraldur P., Hviid, Stubbe F., Kinch, Kjartan M., Gellert, Ralf, Klingelhöfer, Göster, Ming, Douglas W., Morris, Richard V., Rudolf, Rieder, Rodionov, Daniel S., de Souza Jr, Paulo A., Squyres, Steve W., Wdowiak, Tom, and Yen, Albert
Published: 2005

45. Possible physical and thermodynamical evidence for liquid water at the Phoenix landing site

Author: Rennó, Nilton O., primary, Bos, Brent J., additional, Catling, David, additional, Clark, Benton C., additional, Drube, Line, additional, Fisher, David, additional, Goetz, Walter, additional, Hviid, Stubbe F., additional, Keller, Horst Uwe, additional, Kok, Jasper F., additional, Kounaves, Samuel P., additional, Leer, Kristoffer, additional, Lemmon, Mark, additional, Madsen, Morten Bo, additional, Markiewicz, Wojciech J., additional, Marshall, John, additional, McKay, Christopher, additional, Mehta, Manish, additional, Smith, Miles, additional, Zorzano, M. P., additional, Smith, Peter H., additional, Stoker, Carol, additional, and Young, Suzanne M. M., additional
Published: 2009
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46. Search for magnetic minerals in Martian rocks: Overview of the Rock Abrasion Tool (RAT) magnet investigation on Spirit and Opportunity

Author: Goetz, Walter, primary, Leer, Kristoffer, additional, Gunnlaugsson, Haraldur P., additional, Bartlett, Paul, additional, Basso, Brandon, additional, Bell, Jim, additional, Bertelsen, Preben, additional, Binau, Charlotte S., additional, Chu, Phillip C., additional, Gorevan, S., additional, Hansen, Mikkel F., additional, Hviid, Stubbe F., additional, Kinch, Kjartan M., additional, Klingelhöfer, Göstar, additional, Kusack, Alastair, additional, Madsen, Morten B., additional, Ming, Douglas W., additional, Morris, Richard V., additional, Mumm, Erik, additional, Myrick, Tom, additional, Olsen, Malte, additional, Squyres, Steven W., additional, Wilson, Jack, additional, and Yen, Albert, additional
Published: 2008
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47. Instruments for the Magnetic Properties Experiments on Mars Pathfinder

Author: Gunnlaugsson, Haraldur P., primary, Hviid, Stubbe F., additional, Knudsen, Jens M., additional, and Madsen, Morten Bo, additional
Published: 1998
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48. Size-frequency distribution of boulders ≥7 m on comet 67P/Churyumov-Gerasimenko

Author: Da Deppo, Vania, Ip, Wing-Huen, Marzari, Francesco, Scholten, Frank, Preusker, Frank, Besse, Sebastien, Guettler, Carsten, Mottola, Stefano, Barucci, Maria A., Davidsson, Bjoern, De Cecco, Mariolino, Kuert, Ekkehard, La Forgia, Fiorangela, Lopez Moreno, Jose J., Fornasier, Sonia, Hviid, Stubbe F., Cremonese, Gabriele, Lee, Jui-Chi, Bertini, Ivano, Kueppers, Michael, Lazzarin, Monica, Gutierrez, Pedro J., Ferri, Francesca, Lamy, Philippe, Thomas, Nicholas, Lara, Luisa M., Massironi, Matteo, Koschny, Detlef, Auger, Anne-Therese, Vincent, Jean-Baptiste, Knollenberg, Joerg, Debei, Stefano, Groussin, Olivier, Fulle, Marco, Jorda, Laurent, Magrin, Sara, Oklay, Nilda, Bertaux, Jean-Loup, Sierks, Holger, Elmaarry, Mohamed Ramy, Kramm, J. Rainer, Barbieri, Cesare, Keller, Horst U., A'Hearn, Michael F., Pajola, Maurizio, Marchi, Simone, Simioni, Emanuele, Giacomini, Lorenza, Pommerol, Antoine, Tubiana, Cecilia, Lucchetti, Alice, Rickman, Hans, Naletto, Giampiero, Lin, Zhong-Yi, Agarwal, Jessica, Moissl, Richard, Rodrigo, Rafael, and Michalik, Harald
Subjects: 13. Climate action, 530 Physics, 500 Science
Abstract: Aims. We derive for the first time the size-frequency distribution of boulders on a comet, 67P/Churyumov-Gerasimenko (67P), computed from the images taken by the Rosetta/OSIRIS imaging system. We highlight the possible physical processes that lead to these boulder size distributions. Methods. We used images acquired by the OSIRIS Narrow Angle Camera, NAC, on 5 and 6 August 2014. The scale of these images (2.44−2.03 m/px) is such that boulders ≥7 m can be identified and manually extracted from the datasets with the software ArcGIS. We derived both global and localized size-frequency distributions. The three-pixel sampling detection, coupled with the favorable shadowing of the surface (observation phase angle ranging from 48° to 53°), enables unequivocally detecting boulders scattered all over the illuminated side of 67P. Results. We identify 3546 boulders larger than 7 m on the imaged surface (36.4 km2), with a global number density of nearly 100/km2 and a cumulative size-frequency distribution represented by a power-law with index of −3.6 +0.2/−0.3. The two lobes of 67P appear to have slightly different distributions, with an index of −3.5 +0.2/−0.3 for the main lobe (body) and −4.0 +0.3/−0.2 for the small lobe (head). The steeper distribution of the small lobe might be due to a more pervasive fracturing. The difference of the distribution for the connecting region (neck) is much more significant, with an index value of −2.2 +0.2/−0.2. We propose that the boulder field located in the neck area is the result of blocks falling from the contiguous Hathor cliff. The lower slope of the size-frequency distribution we see today in the neck area might be due to the concurrent processes acting on the smallest boulders, such as i) disintegration or fragmentation and vanishing through sublimation; ii) uplifting by gas drag and consequent redistribution; and iii) burial beneath a debris blanket. We also derived the cumulative size-frequency distribution per km2 of localized areas on 67P. By comparing the cumulative size-frequency distributions of similar geomorphological settings, we derived similar power-law index values. This suggests that despite the selected locations on different and often opposite sides of the comet, similar sublimation or activity processes, pit formation or collapses, as well as thermal stresses or fracturing events occurred on multiple areas of the comet, shaping its surface into the appearance we see today.

49. GEOC 4-Physical and thermodynamical evidence for liquid water on Mars

Author: Renno, Nilton O., Bos, Brent J., Catling, David, Clark, Benton C., Drube, Line, Fisher, David, Goetz, Walter, Hviid, Stubbe F., Keller, Horst Uwe, Kok, Jasper F., Kounaves, Samuel P., Leer, Kristoffer, Lemmon, Mark, Madsen, Morten Bo, Markiewicz, Wojciech J., Marshall, John, Mckay, Christopher, Mehta, Manish, Smith, Miles, María-Paz Zorzano, Smith, Peter H., Stoker, Carol, and Young, Suzanne M. M.

50. Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun

Author: Della Corte, Vincenzo, Barucci, M. Antonietta, Jernimo, Jose M., Giovane, Frank, Vincent, Jean-Baptiste, Davidsson, Bjoern, Fornasier, Sonia, Snodgrass, Colin, Cremonese, Gabriele, Palumbo, Pasquale, McDonnell, J. Anthony M., Moreno, Fernando, Debei, Stefano, Bertini, Ivano, Sierks, Holger, Rodriguez, Julio, Molina, Antonio, Rickman, Hans, Bertaux, Jean-Loup, Kueppers, Michael, Michalik, Harald, Lara, Luisa, Ivanovski, Stavro, Fulle, Marco, Perrin, Jean-Marie, Ip, Wing, Thomas, Nicolas, Leese, Mark R., Lowry, Stephen C., Gutierrez, Pedro J., Groussin, Olivier, Lopez-Jimenez, Antonio C., Green, Simon F., Lazzarin, Monica, Lucarelli, Francesca, Tubiana, Cecilia, Keller, Horst Uwe, Kuehrt, Ekkehard, Agarwal, Jessica, Lamy, Philippe L., Angrilli, Francesco, Sabau, Lola, Sordini, Roberto, Bussoletti, Ezio, Zarnecki, John C., Guettler, Carsten, Naletto, Giampiero, Lopez-Moreno, Jose J., Herranz, Miguel L., Oklay, Nilda, Epifani, Elena Mazzotta, Altobelli, Nicolas, Crifo, Jean-Francois, Gruen, Eberhard, De Cecco, Mariolino, Barbieri, Cesare, Rodrigo, Rafael, Cosi, Massimo, Ortiz, Jose L., Kramm, Rainer, Esposito, Francesca, Ferrari, Marco, Wenzel, Klaus-Peter, Jorda, Laurent, A'Hearn, Michael F., Morales, Rafael, Accolla, Mario, Mennella, Vito, Koschny, Detlef, Hviid, Stubbe F., Bodewits, Dennis, Weissman, Paul, Mottola, Stefano, Colangeli, Luigi, Gustafson, Bo, Da Deppo, Vania, Rotundi, Alessandra, Zakharov, Vladimir, Marzari, Francesco, Knollenberg, Joerg, and Palomba, Ernesto
Subjects: 13. Climate action, 530 Physics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.4 astronomical units inbound, GIADA and OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, and 48 grains of mass 10(-5) to 10(-2) kilograms, respectively. Combined with gas data from the MIRO (Microwave Instrument for the Rosetta Orbiter) and ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) instruments, we find a dust/gas mass ratio of 4 +/- 2 averaged over the sunlit nucleus surface. A cloud of larger grains also encircles the nucleus in bound orbits from the previous perihelion. The largest orbiting clumps are meter-sized, confirming the dust/gas ratio of 3 inferred at perihelion from models of dust comae and trails.

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