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156. The IFAE/UAB Raman LIDAR for the CTA-North.

Author

Valore, L., Colalillo, R., Guarino, F., Gaug, Markus, Blanch, Oscar, Çolak, Merve Sıdıka, Doro, Michele, Font, Lluis, Griffths, Scott, Maggio, Camilla, Martinez, Manel, Martinez, Òscar, Munar-Adrover, Pere, and Da Deppo, Vania

Subjects
LIDAR, ATMOSPHERIC aerosols, TELESCOPES, POLYCHROMATORS, COSMIC rays, RAMAN scattering
Abstract

The IFAE/UAB Raman LIDAR project aims to develop a Raman LIDAR suitable for the online atmospheric calibration of the CTA. Requirements for such a solution include the ability to characterize aerosol extinction to distances of more than 20 km with an accuracy better than 5%, within time scales of less than one minute. The Raman LIDAR consists therefore of a large 1.8 m mirror and a powerful pulsed Nd-YAG laser. A liquid light-guide collects the light at the focal plane and transports it to the readout system. An in-house built polychromator has been characterized thoroughly with respect to its capability to separate effciently the different wavelengths (355 nm, 387 nm, 532 nm and 607 nm). It was found to operate according to specifications, particularly that light leakage from the elastic channels (532 nm and 355 nm) into the much dimmer Raman channels (387 nm and 607 nm) could be excluded to less than 2 × 10-7. We present here the status of the integration and commissioning of this solution and plans for the near future. After a one-year test period at the Observatorio del Roque de los Muchachos, an in-depth evaluation of this and the solutions adopted by a similar project developed by the LUPM, Montpellier, will lead to a final Raman LIDAR proposed to be built for both CTA sites. [ABSTRACT FROM AUTHOR]

Published
2019

157. The MDOR/PDOR on-line module for MISO, the planning software of Solar Orbiter instruments

Author

Guzman, Juan C., Ibsen, Jorge, Volpicelli, Cosimo, Landini, Federico, Pancrazzi, Maurizio, Straus, Thomas, Susino, Roberto, Nicolini, Gianalfredo, Sasso, Clementina, Fabi, Michele, De Leo, Yara, Casini, Chiara, Naletto, Giampiero, Nicolosi, Piergiorgio, Spadaro, Daniele, Andretta, Vincenzo, Antonucci, Ester, Fineschi, Silvano, Da Deppo, Vania, Zuppella, Paola, Frassetto, Fabio, Slemer, Alessandra, Mercier, Claude, Kouliche, Dimitri, Caminade, Stephane, Picard, David, Buchlin, Eric, Auchère, Frédéric, and Romoli, Marco

Published
2020
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158. The primary mirror of the Ariel mission: cryotesting of aluminum mirror samples with protected silver coating

Author

Navarro, Ramón, Geyl, Roland, Chioetto, Paolo, Zuppella, Paola, Da Deppo, Vania, Pace, Emanuele, Morgante, Gianluca, Terenzi, Luca, Brienza, Daniele, Missaglia, Nadia, Bianucci, Giovanni, Spinelli, Sebastiano, Guerriero, Elisa, Rossi, Massimiliano, Bondet, Colin, Chauveau, Gregory, Porta, Caroline, Grezes-Besset, Catherine, Malaguti, Giuseppe, and Micela, Giuseppina

Published
2020
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161. Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images

Author

Swedish National Space Board, Ministerio de Economía y Competitividad (España), Agenzia Spaziale Italiana, Centre National de la Recherche Scientifique (France), German Centre for Air and Space Travel, European Space Agency, Masoumzadeh, N., Oklay, N., Kolokolova, L., Sierks, H., Fornasier, S., Barucci, M.A., Vincent, J.B., Tubiana, C., Güttler, C., Preusker, F., Scholten, F., Mottola, S., Hasselmann, P.H., Feller, C., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Bertaux, J.L., Bertini, I., Cremonese, G., Da Deppo, Vania, Davidsson, Björn J. R., Debei, S., De Cecco, M., Fulle, M., Gicquel, A., Groussin, O., Gutiérrez, Pedro J., Hall, I., Hofmann, M., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Knollenberg, J., Kovacs, G., Kramm, J.R., Kührt, E., Küppers, M., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Naletto, G., Shi, X., Thomas, N., Swedish National Space Board, Ministerio de Economía y Competitividad (España), Agenzia Spaziale Italiana, Centre National de la Recherche Scientifique (France), German Centre for Air and Space Travel, European Space Agency, Masoumzadeh, N., Oklay, N., Kolokolova, L., Sierks, H., Fornasier, S., Barucci, M.A., Vincent, J.B., Tubiana, C., Güttler, C., Preusker, F., Scholten, F., Mottola, S., Hasselmann, P.H., Feller, C., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Bertaux, J.L., Bertini, I., Cremonese, G., Da Deppo, Vania, Davidsson, Björn J. R., Debei, S., De Cecco, M., Fulle, M., Gicquel, A., Groussin, O., Gutiérrez, Pedro J., Hall, I., Hofmann, M., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Knollenberg, J., Kovacs, G., Kramm, J.R., Kührt, E., Küppers, M., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Naletto, G., Shi, X., and Thomas, N.

Abstract

Aims. We aim to explore the behavior of the opposition effect as an important tool in optical remote sensing on the nucleus of comet 67P/Churyumov-Gerasimenko (67P), using Rosetta-OSIRIS images acquired in different filters during the approach phase, July-August 2014 and the close flyby images on 14 of February 2015, which contain the spacecraft shadow. Methods. We based our investigation on the global and local brightness from the surface of 67P with respect to the phase angle, also known as phase curve. The local phase curve corresponds to a region that is located at the Imhotep-Ash boundary of 67P. Assuming that the region at the Imhotep-Ash boundary and the entire nucleus have similar albedo, we combined the global and local phase curves to study the opposition-surge morphology and constrain the structure and properties of 67P. The model parameters were furthermore compared with other bodies in the solar system and existing laboratory study. Results. We found that the morphological parameters of the opposition surge decrease monotonically with wavelength, whereas in the case of coherent backscattering this behavior should be the reverse. The results from comparative analysis place 67P in the same category as the two Mars satellites, Phobos and Deimos, which are notably different from all airless bodies in the solar system. The similarity between the surface phase function of 67P and a carbon soot sample at extremely small angles is identified, introducing regolith at the boundary of the Imhotep-Ash region of 67P as a very dark and fluffy layer.© ESO, 2017.

Published
2017

162. Seasonal erosion and restoration of the dust cover on comet 67P/Churyumov-Gerasimenko as observed by OSIRIS onboard Rosetta

Author

European Space Agency, Centre National de la Recherche Scientifique (France), Agenzia Spaziale Italiana, Swedish National Space Board, Ministerio de Economía y Competitividad (España), International Max Planck Research Schools, German Centre for Air and Space Travel, Hu, X., Shi, X., Sierks, H., Fulle, M., Blum, J., Keller, H.U., Kührt, E., Davidsson, B., Güttler, C., Gundlach, B., Pajola, M., Bodewits, D., Vincent, J.B., Oklay, N., Massironi, M., Fornasier, S., Tubiana, C., Groussin, O., Boudreault, S., Höfner, S., Mottola, S., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Agarwal, J., Barucci, M.A., Bertaux, J.L., Bertini, I., Cremonese, G., Da Deppo, Vania, Debei, S., De Cecco, M., Deller, J., El-Maarry, M. R., Gicquel, A., Gutierrez-Marques, P., Gutiérrez, Pedro J., Hofmann, M., Hviid, S.F., Ip, W. H., Jorda, L., Knollenberg, J., Kovacs, G., Kramm, J.R., Küppers, M., Lara, Luisa María, López-Moreno, José Juan, European Space Agency, Centre National de la Recherche Scientifique (France), Agenzia Spaziale Italiana, Swedish National Space Board, Ministerio de Economía y Competitividad (España), International Max Planck Research Schools, German Centre for Air and Space Travel, Hu, X., Shi, X., Sierks, H., Fulle, M., Blum, J., Keller, H.U., Kührt, E., Davidsson, B., Güttler, C., Gundlach, B., Pajola, M., Bodewits, D., Vincent, J.B., Oklay, N., Massironi, M., Fornasier, S., Tubiana, C., Groussin, O., Boudreault, S., Höfner, S., Mottola, S., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Agarwal, J., Barucci, M.A., Bertaux, J.L., Bertini, I., Cremonese, G., Da Deppo, Vania, Debei, S., De Cecco, M., Deller, J., El-Maarry, M. R., Gicquel, A., Gutierrez-Marques, P., Gutiérrez, Pedro J., Hofmann, M., Hviid, S.F., Ip, W. H., Jorda, L., Knollenberg, J., Kovacs, G., Kramm, J.R., Küppers, M., Lara, Luisa María, and López-Moreno, José Juan

Abstract

Context. Dust deposits or dust cover are a prevalent morphology in the northern hemi-nucleus of comet 67P/Churyumov-Gerasimenko (67P). The evolution of the dust deposits was captured by the OSIRIS camera system onboard the Rosetta spacecraft having escorted the comet for over two years. The observations shed light on the fundamental role of cometary activity in shaping and transforming the surface morphology. Aims. We aim to present OSIRIS observations of surface changes over the dust deposits before and after perihelion. The distribution of changes and a timeline of their occurrence are provided. We perform a data analysis to quantify the surface changes and investigate their correlation to water activity from the dust deposits. We further discuss how the results of our investigation are related to other findings from the Rosetta mission. Methods. Surface changes were detected via systematic comparison of images, and quantified using shape-from-shading technique. Thermal models were applied to estimate the erosion of water ice in response to the increasing insolation over the areas where surface changes occurred. Modeling results were used for the interpretation of the observed surface changes. Results. Surface changes discussed here were concentrated at mid-latitudes, between about 20â-N and 40â-N, marking a global transition from the dust-covered to rugged terrains. The changes were distributed in open areas exposed to ample solar illumination and likely subject to enhanced surface erosion before perihelion. The occurrence of changes followed the southward migration of the sub-solar point across the latitudes of their distribution. The erosion at locations of most changes was at least about 0.5 m, but most likely did not exceed several meters. The erosive features before perihelion had given way to a fresh, smooth cover of dust deposits after perihelion, suggesting that the dust deposits had been globally restored by at least about 1 m with ejecta from the intens

Published
2017

163. Evidence of sub-surface energy storage in comet 67P from the outburst of 2016 July 03

Author

Centre National de la Recherche Scientifique (France), German Centre for Air and Space Travel, Agenzia Spaziale Italiana, Swedish National Space Board, Ministerio de Economía y Competitividad (España), European Space Agency, Agarwal, J., Della Corte, V., Feldman, P. D., Geiger, B., Merouane, S., Bertini, I., Bodewits, D., Fornasier, S., Grün, E., Hasselmann, P.H., Hilchenbach, M., Höfner, S., Ivanovski, S., Kolokolova, L., Pajola, M., Rotundi, A., Sierks, H., Steffl, A. J., Thomas, N., A'Hearn, M. F., Barbieri, C., Barucci, M.A., Bertaux, J.L., Boudreault, S., Cremonese, G., Da Deppo, Vania, Davidsson, B., Debei, S., De Cecco, M., Deller, J. F., Feaga, L. M., Fischer, H., Fulle, M., Gicquel, A., Groussin, O., Güttler, C., Gutiérrez, Pedro J., Hofmann, M., Hornung, K., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Kissel, J., Knollenberg, J., Koch, A., Koschny, D., Kramm, J.R., Kührt, E., Küppers, M., Langevin, Y., Lara, Luisa María, López-Moreno, José Juan, Rodrigo Montero, Rafael, Centre National de la Recherche Scientifique (France), German Centre for Air and Space Travel, Agenzia Spaziale Italiana, Swedish National Space Board, Ministerio de Economía y Competitividad (España), European Space Agency, Agarwal, J., Della Corte, V., Feldman, P. D., Geiger, B., Merouane, S., Bertini, I., Bodewits, D., Fornasier, S., Grün, E., Hasselmann, P.H., Hilchenbach, M., Höfner, S., Ivanovski, S., Kolokolova, L., Pajola, M., Rotundi, A., Sierks, H., Steffl, A. J., Thomas, N., A'Hearn, M. F., Barbieri, C., Barucci, M.A., Bertaux, J.L., Boudreault, S., Cremonese, G., Da Deppo, Vania, Davidsson, B., Debei, S., De Cecco, M., Deller, J. F., Feaga, L. M., Fischer, H., Fulle, M., Gicquel, A., Groussin, O., Güttler, C., Gutiérrez, Pedro J., Hofmann, M., Hornung, K., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Kissel, J., Knollenberg, J., Koch, A., Koschny, D., Kramm, J.R., Kührt, E., Küppers, M., Langevin, Y., Lara, Luisa María, López-Moreno, José Juan, and Rodrigo Montero, Rafael

Abstract

On 2016 July 03, several instruments onboard ESA's Rosetta spacecraft detected signs of an outburst event on comet 67P, at a heliocentric distance of 3.32 au from the Sun, outbound from perihelion. We here report on the inferred properties of the ejected dust and the surface change at the site of the outburst. The activity coincided with the local sunrise and continued over a time interval of 14-68 min. It left a 10-m-sized icy patch on the surface. The ejected material comprised refractory grains of several hundred microns in size, and sub-micron-sized water ice grains. The high dust mass production rate is incompatible with the free sublimation of crystalline water ice under solar illumination as the only acceleration process. Additional energy stored near the surface must have increased the gas density. We suggest a pressurized sub-surface gas reservoir, or the crystallization of amorphous water ice as possible causes.© 2015 The Authors.

Published
2017

164. Characterization of dust aggregates in the vicinity of the Rosetta spacecraft

Author

Swedish National Space Board, Ministerio de Economía y Competitividad (España), German Centre for Air and Space Travel, Agenzia Spaziale Italiana, Centre National de la Recherche Scientifique (France), European Space Agency, Güttler, C., Hasselmann, P.H., Li, Y., Fulle, M., Tubiana, C., Kovacs, G., Agarwal, J., Sierks, H., Fornasier, S., Hofmann, M., Gutiérrez Marqués, P., Ott, T., Drolshagen, E., Bertini, I., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Barucci, M.A., Bodewits, D., Bertaux, J.L., Boudreault, S., Cremonese, G., Da Deppo, Vania, Davidsson, B., Debei, S., De Cecco, M., Deller, J., Geiger, B., Groussin, O., Gutiérrez, Pedro J., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Knollenberg, J., Kramm, J.R., Kührt, E., Küppers, M., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Mottola, S., Naletto, G., Oklay, N., Pajola, M., Swedish National Space Board, Ministerio de Economía y Competitividad (España), German Centre for Air and Space Travel, Agenzia Spaziale Italiana, Centre National de la Recherche Scientifique (France), European Space Agency, Güttler, C., Hasselmann, P.H., Li, Y., Fulle, M., Tubiana, C., Kovacs, G., Agarwal, J., Sierks, H., Fornasier, S., Hofmann, M., Gutiérrez Marqués, P., Ott, T., Drolshagen, E., Bertini, I., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Barucci, M.A., Bodewits, D., Bertaux, J.L., Boudreault, S., Cremonese, G., Da Deppo, Vania, Davidsson, B., Debei, S., De Cecco, M., Deller, J., Geiger, B., Groussin, O., Gutiérrez, Pedro J., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Knollenberg, J., Kramm, J.R., Kührt, E., Küppers, M., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Mottola, S., Naletto, G., Oklay, N., and Pajola, M.

Abstract

In a Rosetta/OSIRIS imaging activity in 2015 June, we have observed the dynamic motion of particles close to the spacecraft. Due to the focal setting of the OSIRIS wide angle camera, these particles were blurred, which can be used to measure their distances to the spacecraft. We detected 109 dust aggregates over a 130 min long sequence, and find that their sizes are around a millimetre and their distances cluster between 2 and 40 m from the spacecraft. Their number densities are about a factor 10 higher than expected for the overall coma and highly fluctuating. Their velocities are small compared to the spacecraft orbital motion and directed away from the spacecraft, towards the comet. From this we conclude that they have interacted with the spacecraft and assess three possible scenarios. In the likeliest of the three scenarios, centimetre-sized aggregates collide with the spacecraft and we would observe the fragments. Ablation of a dust layer on the spacecraft's z panel (remote instrument viewing direction) when rotated towards the Sun is a reasonable alternative. We could also measure an acceleration for a subset of 18 aggregates, which is directed away from the Sun and can be explain by a rocket effect, which requires a minimum ice fraction of the order of 0.1 per cent.© 2017 The Authors.

Published
2017

165. 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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166. 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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167. 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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168. 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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169. 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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174. An integrated payload design for the Atmospheric Remote-sensing Infrared Exoplanet Large-survey (ARIEL)

Author

Eccleston, Paul, additional, Tinetti, Giovanna, additional, Beaulieu, Jean-Philippe, additional, Güdel, Manuel, additional, Hartogh, Paul, additional, Micela, Giuseppina, additional, Min, Michiel, additional, Rataj, Miroslaw, additional, Ray, Tom, additional, Ribas, Ignasi, additional, Vandenbussche, Bart, additional, Auguères, Jean-Louis, additional, Bishop, Georgia, additional, Da Deppo, Vania, additional, Focardi, Mauro, additional, Hunt, Thomas, additional, Malaguti, Giuseppe, additional, Middleton, Kevin, additional, Morgante, Gianluca, additional, Ollivier, Marc, additional, Pace, Emanuele, additional, Pascale, Enzo, additional, and Taylor, William, additional

Published
2016
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180. Comet 67P/Churyumov-Gerasimenko: First science results by Rosetta/OSIRIS

Author

Thomas, Nicolas, Sierks, Holger, Barbieri, Cesare, Lamy, Philippe, Rodrigo, Rafael, Koschny, Detlef, Rickman, Hans, Agarwal, Jessica, A Hearn, Michael, Angrilli, Francesco, Barucci, Antonella, Bertaux, Jean-Loup, Bertini, Ivano, Besse, Sebastien, Bodewits, Dennis, Capanna, Claire, Cremonese, Gabriele, Da Deppo, Vania, Davidsson, Björn, Debei, Stefano, Cecco, Mariolino, Ferri, Francesca, Fornasier, Sonia, marco fulle, Gaskell, Robert, Groussin, Olivier, Güttler, Carsten, Gutierrez, Pedroj, Hviid, Stubbe, Ip, Wing-Huen, Jorda, Laurent, Keller, Horst Uwe, Knollenberg, Jörg, Kramm, Rainer, Kührt, Ekkehard, Küppers, Michael, Laforgia, Fiorangela, Lara, Luisa, Lazzarin, Monica, Leyrat, Cedric, Lopez Moreno, Jose Juan, Lowry, Stephen, Magrin, Sara, Marchi, Simone, Marzari, Francesco, Michalik, Harald, Mottola, Stefano, Naletto, Giampiero, Oklay, Nilda, Pajola, Maurizio, Sabau, Lola, Snodgrass, Colin, Tubiana, Cecilia, Vincent, Jean-Baptiste, and Wenzel, Peter

Abstract

ESA's Rosetta mission arrived on August 6, 2014, at target comet 67P/Churyumov-Gerasimenko after 10 years of cruise. OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) is the scientific imaging system onboard Rosetta. It comprises a Narrow Angle Camera (NAC) for nucleus surface and dust studies and a Wide Angle Camera (WAC) for the wide field coma investigations.We present the first science results achieved by OSIRIS from the arrival at the comet throughout the mapping phase. The overview will cover surface morphology and activity of the nucleus as seen in gas, dust, and local jets.AcknowledgementsOSIRIS was built by a consortium led by the Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany, in collaboration with CISAS, University of Padova, Italy, the Laboratoire d'Astrophysique de Marseille, France, the Instituto de Astrofísica de Andalucia, CSIC, Granada, Spain, the Scientific Support Office of the European Space Agency, Noordwijk, The Netherlands, the Instituto Nacional de Técnica Aeroespacial, Madrid, Spain, the Universidad Politéchnica de Madrid, Spain, the Department of Physics and Astronomy of Uppsala University, Sweden, and the Institut für Datentechnik und Kommunikationsnetze der Technischen Universität Braunschweig, Germany. The support of the national funding agencies of Germany (DLR), France (CNES), Italy (ASI), Spain (MEC), Sweden (SNSB), and the ESA Technical Directorate is gratefully acknowledged. We thank the Rosetta Science Ground Segment at ESAC, the Rosetta Mission Operations Centre at ESOC and the Rosetta Project at ESTEC for their outstanding work enabling the science return of the Rosetta Mission.

Published
2014

182. The primary mirror of the ARIEL mission: study of thermal, figuring, and finishing treatments and optical characterization of Al 6061 samples mirrors

Author

Hull, Tony B., Kim, Dae Wook, Hallibert, Pascal, Chioetto, Paolo, Da Deppo, Vania, Zuppella, Paola, Pace, Emanuele, Morgante, Gianluca, Terenzi, Luca, Brienza, Daniele, Diolaiti, Emiliano, Lombini, Matteo, Cortecchia, Fausto, Missaglia, Nadia, Bianucci, Giovanni, Spinelli, Sebastiano, Malaguti, Giuseppe, and Micela, Giuseppina

Published
2019
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185. Optical performance of the Metis coronagraph on the Solar Orbiter ESA mission

Author

Sodnik, Zoran, Karafolas, Nikos, Cugny, Bruno, Frassetto, Fabio, Da Deppo, Vania, Zuppella, Paola, Romoli, Marco, Fineschi, Silvano, Antonucci, Ester, Nicolini, Giana, Naletto, Giampiero, Nicolosi, Piergiorgio, Spadaro, Daniele, Andretta, Vincenzo, Castronuovo, Marco, Casti, Marta, Capobianco, Gerardo, Massone, Giuseppe, Susino, Roberto, Landini, Federico, Pancrazzi, Maurizio, Teriaca, Luca, Schühle, Udo, Heerlein, Klaus, and Uslenghi, Michela

Published
2019
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186. 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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187. 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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188. 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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189. 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
Full Text
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191. DTM generation from STC-SIMBIO-SYS images

Author

Re, C., additional, Simioni, E., additional, Cremonese, G., additional, Roncella, R., additional, Forlani, G., additional, Da Deppo, Vania, additional, Naletto, G., additional, and Salemi, G., additional

Published
2015
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192. The Wide Angle Camera of the OSIRIS system onboard the Rosetta ESA mission

Author

Da Deppo, Vania, Cesare Barbieri, Angrilli, Francesco, Ivano Bertini, Cremonese, Gabriele, Stefano Debei, Cecco, Mariolino, Francesca Ferri, Monica Lazzarin, Magrin, S., Marchi, S., Matteo Massironi, Giampiero Naletto, MARCO PERTILE, mirco zaccariotto, and AND THE OSIRIS TEAM

Abstract

Rosetta is one of the cornerstone missions of the European Space Agency (ESA) dedicated to the exploration of the periodic 67P/Churyumov-Gerasimenko comet. The main mission objective is to study the physical evolution of the nucleus of the comet and of its dust and gas environment from 3-4 AU to perihelion. The Rosetta spacecraft is experiencing a rather long interplanetary journey, about 10 years, with also one Mars and three Earth gravity assists, before reaching the comet in 2014. The spacecraft has also the chance to flyby two main belt asteroids: (2867) Steins in September 2008 and (21) Lutetia in July 2010. The scientific payload of the mission consists of both remote and in situ instruments. One of the remote sensing instruments on board the satellite is OSIRIS, realized by a cooperation among several European institutes [1]. OSIRIS is a double camera comprising a narrow angle camera, NAC, and a wide angle camera, WAC. The NAC [2], having the higher spatial resolution, is able to study the comet nucleus surface properties in great detail; the WAC, thanks to its large field of view, is able to image the limb and the coma to study the evolution of weak coma structures near the bright nucleus, providing information on gas and dust outflow and jets directly above the comet nucleus surface [3]. The WAC camera adopts an all reflecting, unvignetted and unobstructed two mirrors configuration, which allows to cover a 12° x 12° Field of View with an F/5.6 aperture and a geometrical Ensquared Energy better than 80% inside approximately 20 arcsec. The WAC is equipped with 14 filters in the 230-720 nm wavelength range, they have been especially selected to study the gas and dust comet emissions. The flight model of the WAC has been successfully integrated and tested in our laboratories and finally has been integrated on the Rosetta spacecraft. The optimal performance of the camera has also been proved and exploited in-flight during the Mars swing-by (February 2007), Earth swing-bys in November 2007 and in November 2009, when impressive images of the red planet and of our Earth-Moon system have been successfully taken. Many images had also been taken during the asteroids Steins flyby on the 5th of September 2008, enabling us to study the surface photometrical and structural properties, to date the asteroid starting from cratering history and also to derive a 3-dimensional model of the asteroid itself [4].

Published
2010

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

Author

Leyrat, Cedric, Sierks, H, Barbieri, Cesare, Barucci, A, DA DEPPO, Vania, V, Leon, De, Fulchignoni, J, Fornasier, M, Groussin, S, Hviid, O, S. F, Jorda, Keller, L, H. U., LA FORGIA, Fiorangela, Lara, F, Lazzarin, L, Lazzarin, Monica, Magrin, S, Marchi, Simone, Thomas, N, Schroder, S. E, and Osiris, Team

Subjects
images, Lutetia Asteroid, Rosetta mission, Surface spectral properties, Osiris
Published
2010

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

Author

Keller H, U., Schroder S, E., Hviid S, F., Spjuth, S., Jorda, L., Groussin, O., Thomas, N., Barucci A, M., Fornasier, S., Leyrat, C., Besse, S., Da Deppo, Vania, Stefano Debei, Francesca Ferri, Marchi, Simone, Moissl, R., Tubiana, C., Vincent J, B., Lara L, M., Leon, J., Kuppers, M., Magrin, Sara, Monica Lazzarin, Vernazza, P., Cesare Barbieri, Sierks, H., and Osiris, Team

Subjects
Geomorphology, Color variegation, Asteroid Lutetia, Rosetta mission
Abstract

On July 10, 2010, the ESA Rosetta mission successfully flew by the big asteroid 21 Lutetia. The scientific camera system OSIRIS took 462 images through 24 filters of the narrow angle (NAC) and wide angle (WAC) cameras. Near closest approach (CA) the whole body (northern hemisphere) of Lutetia was imaged with a scale of 60 m per pixel. As expected the surface morphology of Lutetia is dominated by large impact craters, some comparable to the radius of the asteroid. Smooth near craterless terrains indicate recent impacts and ejecta. Features found on discernable regional units include craters, grabens, scarps, pits, ridges, contacts, and large boulders. Craters with sharp and steep walls (some with landslides), some with irregular shapes and others almost filled with regolith are found. A topographic shape and photometric model of Lutetia as developed for the interpretation of the OSIRIS results of asteroid Steins (Jorda et al. 2010, Spjuth et al. 2010) will provide local slopes and gravity. The OSIRIS filters have been extensively calibrated in-flight and images will be used to construct photo-metrically accurate colour ratio maps which have been shown to be of importance for the study of geological units and morphological features.

Published
2010

196. Wide angle and stereo cameras for JGO

Author

Cremonese, Gabriele, Langevin, Y., Lara, L. M., Neukum, G., Capria, M. T., Stefano Debei, Castro, J. M., Eng, P., Vangasselt, S., Adriani, A., Basilevsky, A. T., Behnke, T., Carlo BETTANINI FECIA DI COSSATO, Capaccioni, F., Colangeli, L., Da Deppo, Vania, Desanctis, M. C., Denk, T., Fabel, O., Filacchione, G., Galuba, G., Gwinner, K., Hartmann, O., Haruyama, J., Hiesinger, H., Hoffmann, H., Jaumann, R., Martellato, E., FRANCESCO MARZARI, Matteo Massironi, Michaelis, H., Giampiero Naletto, Oberst, J., Palumbo, P., MARCO PERTILE, Schmedemann, N., Schneider, N., Tosi, F., and mirco zaccariotto

Abstract

In May 2009 we have submitted to ESA a Declaration of Interest for a camera package to be place d onboard the ESA-led Jupiter Ganymede Orbiter, the JGO-WASC (JGO Wide Angle and Stereo Cameras). The camera package we are proposing includes the wide angle and the medium resolution cameras (WAC and MRC), that will be used for the scientific investigation and imaging exploration of the Jovian system and Ganymede in the visible spectral range (350-1050nm) and in stereo mode. The study will be carried out by a consortium currently led by INAF-OAPD (Italy) and including INAF-IFSI (Italy), INAF-IASF (Italy), CISAS & DEI & dep.Geosciences & dep. Physics-University of Padova (Italy), University Parthenope Napoli (Italy), INAF-OAC Napoli (Italy), IAS-Orsay (France), Free University of Berlin (Germany), IAA-CSIC Granada (Spain), DLR Berlin (Germany), Technical University Berlin (Germany), University of Muenster (Germany), University of Colorado Boulder (USA), ISAS-JAXA Kanagawa (Japan), Galileo Avionica (Italy).

Published
2009

197. 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

198. 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

199. 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

200. 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

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