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3. Dust environment and dynamical history of a sample of short period comets

Author

Pozuelos, F. J., Moreno, F., Aceituno, F., Casanova, V., Sota, A., López-Moreno, J. J., Castellano, J., Reina, E., Diepvens, A., Betoret, A., Häusler, B., González, C., Rodríguez, D., Bryssinck, E., Cortés, E., García, F., Limón, F., Grau, F., Fratev, F., Baldrís, F., Rodriguez, F. A., Montalbán, F., Soldán, F., Muler, G., Almendros, I., Temprano, J., Bel, J., Sánchez, J., Lopesino, J., Báez, J., Hernández, J. F., Martín, J. L., Ruiz, J. M., Vidal, J. R., Gaitán, J., Salto, J. L., Aymamí, J. M., Bosch, J. M., Henríquez, J. A., Martín, J. J., Lacruz, J., Tremosa, L., Lahuerta, L., Reszelsky, M., Rodríguez, M., Camarasa, M., Campas, M., Canales, O., Dekelver, P. J., Moreno, Q., Benavides, R., Naves, R., Dymoc, R., García, R., Lahuerta, S., and Climent, T.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Aims. In this work, we present an extended study of the dust environment of a sample of short period comets and their dynamical history. With this aim, we characterized the dust tails when the comets are active, and we made a statistical study to determine their dynamical evolution. The targets selected were 22P/Kopff, 30P/Reinmuth 1, 78P/Gehrels 2, 115P/Maury, 118P/Shoemaker-Levy 4, 123P/West-Hartley, 157P/Tritton, 185/Petriew, and P/2011 W2 (Rinner). Methods. We use two different observational data: a set of images taken at the Observatorio de Sierra Nevada and the Afrho curves provided by the amateur astronomical association Cometas-Obs. To model these observations, we use our Monte Carlo dust tail code. From this analysis, we derive the dust parameters, which best describe the dust environment: dust loss rates, ejection velocities, and size distribution of particles. On the other hand, we use a numerical integrator to study the dynamical history of the comets, which allows us to determine with a 90% of confidence level the time spent by these objects in the region of Jupiter Family Comets. Results. From the Monte Carlo dust tail code, we derived three categories attending to the amount of dust emitted: Weakly active (115P, 157P, and Rinner), moderately active (30P, 123P, and 185P), and highly active (22P, 78P, and 118P). The dynamical studies showed that the comets of this sample are young in the Jupiter Family region, where the youngest ones are 22P (100 yr), 78P (500 yr), and 118P (600 yr). The study points to a certain correlation between comet activity and time spent in the Jupiter Family region, although this trend is not always fulfilled. The largest particle sizes are not tightly constrained, so that the total dust mass derived should be regarded as lower limits.}, Comment: 14 pages, 25 figures, Accepted for publication in A&A

Published
2014
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5. EPOXI: COMET 103P/HARTLEY 2 OBSERVATIONS FROM A WORLDWIDE CAMPAIGN

Author

Meech, KJ, A’Hearn, MF, Adams, JA, Bacci, P, Bai, J, Barrera, L, Battelino, M, Bauer, JM, Becklin, E, Bhatt, B, Biver, N, Bockelée-Morvan, D, Bodewits, D, Böhnhardt, H, Boissier, J, Bonev, BP, Borghini, W, Brucato, JR, Bryssinck, E, Buie, MW, Canovas, H, Castellano, D, Charnley, SB, Chen, WP, Chiang, P, Choi, Y-J, Christian, DJ, Chuang, Y-L, Cochran, AL, Colom, P, Combi, MR, Coulson, IM, Crovisier, J, Dello Russo, N, Dennerl, K, DeWahl, K, DiSanti, MA, Facchini, M, Farnham, TL, Fernández, Y, Florén, HG, Frisk, U, Fujiyoshi, T, Furusho, R, Fuse, T, Galli, G, García-Hernández, DA, Gersch, A, Getu, Z, Gibb, EL, Gillon, M, Guido, E, Guillermo, RA, Hadamcik, E, Hainaut, O, Hammel, HB, Harker, DE, Harmon, JK, Harris, WM, Hartogh, P, Hashimoto, M, Häusler, B, Herter, T, Hjalmarson, A, Holland, ST, Honda, M, Hosseini, S, Howell, ES, Howes, N, Hsieh, HH, Hsiao, H-Y, Hutsemékers, D, Immler, SM, Jackson, WM, Jeffers, SV, Jehin, E, Jones, TJ, de Juan Ovelar, M, Kaluna, HM, Karlsson, T, Kawakita, H, Keane, JV, Keller, LD, Kelley, MS, Kinoshita, D, Kiselev, NN, Kleyna, J, Knight, MM, Kobayashi, H, Kobulnicky, HA, Kolokolova, L, Kreiny, M, Kuan, Y-J, Küppers, M, Lacruz, JM, Landsman, WB, Lara, LM, Lecacheux, A, Levasseur-Regourd, AC, and Li, B

Subjects
comets: individual, Astronomical and Space Sciences, Astronomy & Astrophysics
Abstract

Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths and using techniques that are impossible with an in situ flyby. We report here such observations in support of the EPOXI spacecraft flyby of comet 103P/Hartley 2. The nucleus is small and dark, and exhibited a very rapidly changing rotation period. Prior to the onset of activity, the period was 16.4hr. Starting in 2010 August the period changed from 16.6hr to near 19hr in December. With respect to dust composition, most volatiles and carbon and nitrogen isotope ratios, the comet is similar to other Jupiter-family comets. What is unusual is the dominance of CO 2 -driven activity near perihelion, which likely persists out to aphelion. Near perihelion the comet nucleus was surrounded by a large halo of water-ice grains that contributed significantly to the total water production. © 2011. The American Astronomical Society. All rights reserved..

Published
2011

8. Solar System Interiors, Atmospheres, and Surfaces Investigations via Radio Links: Goals for the Next Decade

Author

Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Asmar, Sami, Preston, R. A., Vergados, P., Atkinson, D. H., Andert, T., Ando, H., Ao, C. O., Armstrong, J. W., Ashby, N., Barriot, J.-P., Beauchamp, P. M., Bell, D. J., Bender, P. L., Benedetto, M. Di, Bills, B. G., Bird, M. K., Bocanegra-Bahamon, T. M., Botteon, G. K., Bruinsma, S., Buccino, D. R., Cahoy, K. L., Cappuccio, P., Choudhary, R. K., Dehant, V., Dumoulin, C., Durante, D., Edwards, C. D., Elliott, H. M., Ely, T. A., Ermakov, A. I., Ferri, F., Flasar, F. M., French, R. G., Genova, A., Goossens, S. J., Häusler, B., Helled, R., Hinson, D. P., Hofstadter, M. D., Iess, L., Imamura, T., Jongeling, A. P., Karatekin, Ö., Kaspi, Y., Kobayashi, M. M., Komjathy, A., Konopliv, A. S., Kursinski, E. R., Lazio, T. J. W., Maistre, S. Le, Lemoine, F. G., Lillis, R. J., Linscott, I. R., Mannucci, A. J., Marouf, E. A., Marty, J.-C., Matousek, S. E., Matsumoto, K., Mazarico, E. M., Notaro, V., Parisi, M., Park, R. S., Pätzold, M., Peytaví, G. G., Pugh, M. P., Rennó, N. O., Rosenblatt, P., Serra, D., Simpson, R. A., Smith, D. E., Steffes, P. G., Tapley, B. D., Tellmann, S., Tortora, P., Turyshev, S. G., Hoolst, T. Van, Verma, A. K., Watkins, M. M., Williamson, W., Wieczorek, M. A., Withers, P., Yseboodt, M., Yu, N., Zannoni, M., Zuber, M. T., Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Asmar, Sami, Preston, R. A., Vergados, P., Atkinson, D. H., Andert, T., Ando, H., Ao, C. O., Armstrong, J. W., Ashby, N., Barriot, J.-P., Beauchamp, P. M., Bell, D. J., Bender, P. L., Benedetto, M. Di, Bills, B. G., Bird, M. K., Bocanegra-Bahamon, T. M., Botteon, G. K., Bruinsma, S., Buccino, D. R., Cahoy, K. L., Cappuccio, P., Choudhary, R. K., Dehant, V., Dumoulin, C., Durante, D., Edwards, C. D., Elliott, H. M., Ely, T. A., Ermakov, A. I., Ferri, F., Flasar, F. M., French, R. G., Genova, A., Goossens, S. J., Häusler, B., Helled, R., Hinson, D. P., Hofstadter, M. D., Iess, L., Imamura, T., Jongeling, A. P., Karatekin, Ö., Kaspi, Y., Kobayashi, M. M., Komjathy, A., Konopliv, A. S., Kursinski, E. R., Lazio, T. J. W., Maistre, S. Le, Lemoine, F. G., Lillis, R. J., Linscott, I. R., Mannucci, A. J., Marouf, E. A., Marty, J.-C., Matousek, S. E., Matsumoto, K., Mazarico, E. M., Notaro, V., Parisi, M., Park, R. S., Pätzold, M., Peytaví, G. G., Pugh, M. P., Rennó, N. O., Rosenblatt, P., Serra, D., Simpson, R. A., Smith, D. E., Steffes, P. G., Tapley, B. D., Tellmann, S., Tortora, P., Turyshev, S. G., Hoolst, T. Van, Verma, A. K., Watkins, M. M., Williamson, W., Wieczorek, M. A., Withers, P., Yseboodt, M., Yu, N., Zannoni, M., and Zuber, M. T.

Published
2022

15. Rosetta Radio Science Investigations : Gravity Investigations at Comet P/Wirtanen

Author

Pätzold, M., Neubauer, F. M., Wennmacher, A., Aksnes, K., Anderson, J. D., Asmar, S. W., Tinto, M., Tsurutani, B. T., Yeomans, D. K., Barriot, J.-P., Bird, M. K., Boehnhardt, H., Gill, E., Montenbruck, O., Grün, E., Häusler, B., Ip, W. H., Thomas, N., Marouf, E. A., Rickman, H., Wallis, M. K., Wickramasinghe, N. C., Wytrzyszczak, I. M., editor, Lieske, J. H., editor, and Feldman, R. A., editor

Published
1997
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17. Venus express: Highlights of the nominal mission

Author

Titov, D. V., Svedhem, H., Taylor, F. W., Barabash, S., Bertaux, J. -L., Drossart, P., Formisano, V., Häusler, B., Korablev, O., Markiewicz, W. J., Nevejans, D., Pätzold, M., Piccioni, G., Sauvaud, J. -A., Zhang, T. L., Witasse, O., Gerard, J. -C., Fedorov, A., Sanchez-Lavega, A., Helbert, J., and Hoofs, R.

Published
2009
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18. Solar System Interiors, Atmospheres, and Surfaces Investigations via Radio Links: Goals for the Next Decade

Author

Asmar, Sami, primary, Preston, R. A., additional, Vergados, P., additional, Atkinson, D. H., additional, Andert, T., additional, Ando, H., additional, Ao, C. O., additional, Armstrong, J. W., additional, Ashby, N., additional, Barriot, J.-P., additional, Beauchamp, P. M., additional, Bell, D. J., additional, Bender, P. L., additional, Benedetto, M. Di, additional, Bills, B. G., additional, Bird, M. K., additional, Bocanegra-Bahamon, T. M., additional, Botteon, G. K., additional, Bruinsma, S., additional, Buccino, D. R., additional, Cahoy, K. L., additional, Cappuccio, P., additional, Choudhary, R. K., additional, Dehant, V., additional, Dumoulin, C., additional, Durante, D., additional, Edwards, C. D., additional, Elliott, H. M., additional, Ely, T. A., additional, Ermakov, A. I., additional, Ferri, F., additional, Flasar, F. M., additional, French, R. G., additional, Genova, A., additional, Goossens, S. J., additional, Häusler, B., additional, Helled, R., additional, Hinson, D. P., additional, Hofstadter, M. D., additional, Iess, L., additional, Imamura, T., additional, Jongeling, A. P., additional, Karatekin, Ö., additional, Kaspi, Y., additional, Kobayashi, M. M., additional, Komjathy, A., additional, Konopliv, A. S., additional, Kursinski, E. R., additional, Lazio, T. J. W., additional, Maistre, S. Le, additional, Lemoine, F. G., additional, Lillis, R. J., additional, Linscott, I. R., additional, Mannucci, A. J., additional, Marouf, E. A., additional, Marty, J.-C., additional, Matousek, S. E., additional, Matsumoto, K., additional, Mazarico, E. M., additional, Notaro, V., additional, Parisi, M., additional, Park, R. S., additional, Pätzold, M., additional, Peytaví, G. G., additional, Pugh, M. P., additional, Rennó, N. O., additional, Rosenblatt, P., additional, Serra, D., additional, Simpson, R. A., additional, Smith, D. E., additional, Steffes, P. G., additional, Tapley, B. D., additional, Tellmann, S., additional, Tortora, P., additional, Turyshev, S. G., additional, Hoolst, T. Van, additional, Verma, A. K., additional, Watkins, M. M., additional, Williamson, W., additional, Wieczorek, M. A., additional, Withers, P., additional, Yseboodt, M., additional, Yu, N., additional, Zannoni, M., additional, and Zuber, M. T., additional

Published
2021
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20. Venus Express—The first European mission to Venus

Author

Svedhem, H., Titov, D.V., McCoy, D., Lebreton, J.-P., Barabash, S., Bertaux, J.-L., Drossart, P., Formisano, V., Häusler, B., Korablev, O., Markiewicz, W.J., Nevejans, D., Pätzold, M., Piccioni, G., Zhang, T.L., Taylor, F.W., Lellouch, E., Koschny, D., Witasse, O., Eggel, H., Warhaut, M., Accomazzo, A., Rodriguez-Canabal, J., Fabrega, J., Schirmann, T., Clochet, A., and Coradini, M.

Published
2007
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24. Venus Express science planning

Author

Titov, D.V., Svedhem, H., Koschny, D., Hoofs, R., Barabash, S., Bertaux, J.-L., Drossart, P., Formisano, V., Häusler, B., Korablev, O., Markiewicz, W.J., Nevejans, D., Pätzold, M., Piccioni, G., Zhang, T.L., Merritt, D., Witasse, O., Zender, J., Accomazzo, A., Sweeney, M., Trillard, D., Janvier, M., and Clochet, A.

Published
2006
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29. Mars Express 10 years at Mars: Observations by the Mars Express Radio Science Experiment (MaRS)

Author

UCL - SST/ELI/ELIC - Earth & Climate, Pätzold, M., Häusler, B., Tyler, G.L., Andert, T., Asmar, S.W., Bird, M.K., Dehant, Véronique, UCL - SST/ELI/ELIC - Earth & Climate, Pätzold, M., Häusler, B., Tyler, G.L., Andert, T., Asmar, S.W., Bird, M.K., and Dehant, Véronique

Abstract

The Mars Express spacecraft is operating in Mars orbit since early 2004. The Mars Express Radio Science Experiment (MaRS) employs the spacecraft and ground station radio systems (i) to conduct radio occultations of the atmosphere and ionosphere to obtain vertical profiles of temperature, pressure, neutral number densities and electron density, (ii) to conduct bistatic radar experiments to obtain information on the dielectric and scattering properties of the surface, (iii) to investigate the structure and variation of the crust and lithosphere in selected target areas, (iv) to determine the mass, bulk and internal structure of the moon Phobos, and (v) to track the MEX radio signals during superior solar conjunction to study the morphology of coronal mass ejections (CMEs). Here we report observations, results and discoveries made in the Mars environment between 2004 and 2014 over almost an entire solar cycle. © 2016 Elsevier Ltd.

Published
2016

32. Mars Express 10 years at Mars: Observations by the Mars Express Radio Science Experiment (MaRS)

Author

Pätzold, M., primary, Häusler, B., additional, Tyler, G.L., additional, Andert, T., additional, Asmar, S.W., additional, Bird, M.K., additional, Dehant, V., additional, Hinson, D.P., additional, Rosenblatt, P., additional, Simpson, R.A., additional, Tellmann, S., additional, Withers, P., additional, Beuthe, M., additional, Efimov, A.I., additional, Hahn, M., additional, Kahan, D., additional, Le Maistre, S., additional, Oschlisniok, J., additional, Peter, K., additional, and Remus, S., additional

Published
2016
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35. Update of the Venus density and temperature profiles at high altitude measured by SOIR on board Venus Express

Author

Mahieux, A., primary, Vandaele, A.C., additional, Bougher, S.W., additional, Drummond, R., additional, Robert, S., additional, Wilquet, V., additional, Chamberlain, S, additional, Piccialli, A., additional, Montmessin, F., additional, Tellmann, S., additional, Pätzold, M., additional, Häusler, B., additional, and Bertaux, J.L., additional

Published
2015
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37. Dust environment and dynamical history of a sample of short-period comets

Author

Pozuelos, F. J., primary, Moreno, F., additional, Aceituno, F., additional, Casanova, V., additional, Sota, A., additional, López-Moreno, J. J., additional, Castellano, J., additional, Reina, E., additional, Climent, A., additional, Fernández, A., additional, San Segundo, A., additional, Häusler, B., additional, González, C., additional, Rodriguez, D., additional, Bryssinck, E., additional, Cortés, E., additional, Rodriguez, F. A., additional, Baldris, F., additional, García, F., additional, Gómez, F., additional, Limón, F., additional, Tifner, F., additional, Muler, G., additional, Almendros, I., additional, de los Reyes, J. A., additional, Henríquez, J. A., additional, Moreno, J. A., additional, Báez, J., additional, Bel, J., additional, Camarasa, J., additional, Curto, J., additional, Hernández, J. F., additional, González, J. J., additional, Martín, J. J., additional, Salto, J. L., additional, Lopesino, J., additional, Bosch, J. M., additional, Ruiz, J. M., additional, Vidal, J. R., additional, Ruiz, J., additional, Sánchez, J., additional, Temprano, J., additional, Aymamí, J. M., additional, Lahuerta, L., additional, Montoro, L., additional, Campas, M., additional, García, M. A., additional, Canales, O., additional, Benavides, R., additional, Dymock, R., additional, García, R., additional, Ligustri, R., additional, Naves, R., additional, Lahuerta, S., additional, and Pastor, S., additional

Published
2014
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38. Lunar Exploration Orbiter (LEO): Providing a Globally Covered, Highly Resolved Integrated, Geological, Geochemical and Geophysical Data Base of the Moon

Author

Jaumann, R., Spohn, T., Hiesinger, H., Jessberger, E.K., Neukum, G., Oberst, J., Helbert, J., Christensen, U., Keller, H.U., Mall, U., Böhnhardt, H., Hartogh, P., Glassmeier, K.-H., Auster, H.-U., Moreira, A., Werner, M., Pätzold, M., Palme, H., Wimmer-Schweingruber, R., Mandea, M., Flechtner, F., Lesur, V., Häusler, B., Srama, R., Kempf, S., Hördt, A., Eichentopf, K., Hauber, E., Hoffmann, H., Köhler, U., Kührt, E., Michaelis, H., Pauer, M., Sohl, F., Denk, T., and van Gasselt, S.

Subjects
Institut für Planetenforschung, LEO, 550 - Earth sciences, Solar System, orbiter, MOON
Abstract

The German initiative for the Lunar Exploration Orbiter (LEO) originated from the national conference “Exploration of our Solar System”, held in Dresden in November 2006. Major result of this conference was that the Moon is of high interest for the scientific community for various reasons, it is affordable to perform an orbiting mission to Moon and it insures technological and scientific progress necessary to assist further exploration activities of our Solar System. Based on scientific proposals elaborated by 50 German scientists in January 2007, a preliminary payload of 12 instruments was defined. Further analysis were initated by DLR in the frame of two industry contracts, to perform a phase-zero mission definition. The Moon, our next neighbour in the Solar System is the first choice to learn, how to work and live without the chance of immediate support from earth and to get prepared for further and farther exploration missions. We have to improve our scientific knowledge base with respect to the Moon applying modern and state of the art research tools and methods. LEO is planed to be launched in 2012 and shall orbit the Moon for about four years in a low altitude orbit.

Published
2007

39. Konzept eines Lunaren Explorations Orbiters (LEO), Vorschlag für eine Wissenschaftliche Mondmission

Author

Jaumann, R., Spohn, T., Eichentopf, K., Hauber, E., Helbert, J., Hoffmann, H., Köhler, U., Kührt, E., Michaelis, H., Oberst, J., Pauer, M., Sohl, F., Hiesinger, H., Jessberger, E., Neukum, G., Denk, T., van Gasselt, S., Christensen, U., Keller, H., Mall, U., Böhnhardt, H., Hartogh, P., Glassmeier, K., Auster, H., Hördt, A., Moreira, A., Werner, M., Pätzold, M., Palme, H., Wimmer-Schweingruber, R., Mandea, M., Lesur, V., and Häusler, B.

Subjects
550 - Earth sciences
Published
2007

40. Lunar Exploration Orbiter (LEO)

Author

Jaumann, R., Spohn, T., Hiesinger, H., Jessberger, E., Neukum, G., Oberst, J., Helbert, J., Christensen, U., Keller, H., Mall, U., Böhnhardt, H., Hartogh, P., Glassmeier, K., Auster, H., Moreira, A., Werner, M., Pätzold, M., Palme, H., Wimmer-Schweingruber, R., Mandea, M., Lesur, V., Häusler, B., Hördt, A., Eichentopf, K., Hauber, E., Hoffmann, H., Köhler, U., Kührt, E., Michaelis, H., Pauer, M., Sohl, F., Denk, T., and van Gasselt, S.

Subjects
550 - Earth sciences
Published
2007

41. Venus Express: first months of science operations in orbit

Author

Titov, Dmitry V., Svedhem, Håkan, Barabash, Stas, Bertaux, Jean-Loup, Drossart, Pierre, Formisano, Vittorio, Häusler, B., Markiewicz, Wojciech J., Piccioni, Giuseppe, Zhang, T., Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Max-Planck-Gesellschaft, European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), Swedish Institute of Space Physics [Kiruna] (IRF), 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), 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), Istituto di Fisica dello Spazio Interplanetario (IFSI), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Institut für Raumfahrttechnik, Universität der Bundeswehr München [Neubiberg], Istituto di Astrofisica Spaziale e Fisica cosmica - Roma (IASF-Roma), and Istituto Nazionale di Astrofisica (INAF)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; By the time of the COSPAR Assembly Venus Express will be already 3 months in orbit and about 40 days in nominal mission The mission science plan includes pericentre nadir observations off-pericentre and apocentre mosaics limb observations solar stellar and Earth occultation These observation modes will be extensively used from the very beginning of the mission The talk will show how these operations are combined together in order to fully exploit the spacecraft and payload capabilities and to achieve the mission goals Due attention will be paid to synergy between experiments in addressing the main science themes

Published
2006

42. Venus Express first results - An Overview

Author

Svedhem, Håkan, Titov, Dmitry V., Barabash, Stas, Bertaux, Jean-Loup, Drossart, Pierre, Formisano, Vittorio, Häusler, B., Markiewicz, Wojciech J., Piccioni, Giuseppe, Zhang, T., Witasse, Olivier, European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Max-Planck-Gesellschaft, Swedish Institute of Space Physics [Kiruna] (IRF), 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), 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), Istituto di Astrofisica Spaziale e Fisica cosmica - Roma (IASF-Roma), Istituto Nazionale di Astrofisica (INAF), Institut für Raumfahrttechnik, Universität der Bundeswehr München [Neubiberg], Space Research Institute of Austrian Academy of Sciences (IWF), and Austrian Academy of Sciences (OeAW)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; The Venus Express spacecraft arrives to Venus and will be inserted into orbit on 11 April 2006 Venus Express will carry out an in depth study of the atmosphere of Venus and will study the plasma environment and its intearaction with the solar wind as well as investigating selected surface related topics The paylod is composed of seven instruments ASPERA -an instrument for in situ detection and characterisation of energetic neutral and charged particles MAG - a dual sensor fluxgate magnetometer PFS - an IR Fourier spectrometer VIRTIS - a mapping UV-vis-IR spectrometer Spicav SOIR - an UV-IR stellar and solar occultation spectrometer VMC - a four band wide angle camera and VeRa - a radio science experiment including occultation and bistatic radar functions This paper will give an overview of the mission and briefly summarize the first results from Venus orbit as an introduction to the invited talks to follow by the PIs of the respective instruments

Published
2006

43. Feasibility study for a precise mass determination of the moon Phobos by the radio science experiment MaRS on Mars-Express

Author

Andert, Thomas P., Pätzold, M., Lainey, Valéry, Rosenblatt, Pascal, Dehant, Véronique, Häusler, B., 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), Astronomie et systèmes dynamiques (ASD), 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, and Groupe Astrométrie et Planétologie (GAP)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2005

45. First ever in situ observations of Venus' polar upper atmosphere density using the tracking data of the Venus Express Atmospheric Drag Experiment (VExADE)

Author

UCL - SST/ELI - Earth and Life Institute, Rosenblatt, Pascal, Bruinsma, S.L., Müller-Wodarg, I.C.F., Häusler, B., Svedhem, H., Marty, J.C., UCL - SST/ELI - Earth and Life Institute, Rosenblatt, Pascal, Bruinsma, S.L., Müller-Wodarg, I.C.F., Häusler, B., Svedhem, H., and Marty, J.C.

Abstract

On its highly elliptical 24. h orbit around Venus, the Venus Express (VEX) spacecraft briefly reaches a periapsis altitude of nominally 250. km. Recently, however, dedicated and intense radio tracking campaigns have taken place in August 2008, October 2009, February and April 2010, for which the periapsis altitude was lowered to the 186-176. km altitude range in order to be able to probe the upper atmosphere of Venus above the North Pole for the first time ever in situ. As the spacecraft experiences atmospheric drag, its trajectory is measurably perturbed during the periapsis pass, allowing us to infer total atmospheric mass density at the periapsis altitude. A Precise Orbit Determination (POD) of the VEX motion is performed through an iterative least-squares fitting process to the Doppler tracking data, acquired by the VEX radioscience experiment (VeRa). The drag acceleration is modelled using an initial atmospheric density model (VTS3 model, Hedin, A.E., Niemann, H.B., Kasprzak, W.T., Seiff, A. [1983]. J. Geophys. Res. 88, 73-83). A scale factor of the drag acceleration is estimated for each periapsis pass, which scales Hedin's density model in order to best fit the radio tracking data. Reliable density scale factors have been obtained for 10 passes mainly from the second (October 2009) and third (April 2010) VExADE campaigns, which indicate a lower density by a factor of about 1.8 than Hedin's model predicts. These first ever in situ polar density measurements at solar minimum have allowed us to construct a diffusive equilibrium density model for Venus' thermosphere, constrained in the lower thermosphere primarily by SPICAV-SOIR measurements and above 175. km by the VExADE drag measurements (Müller-Wodarg et al., in preparation). The preliminary results of the VExADE campaigns show that it is possible to obtain with the POD technique reliable estimates of Venus' upper atmosphere densities at an altitude of around 175. km. Future VExADE campaigns will benefit from

Published
2012

46. Precise mass determination and the nature of Phobos

Author

UCL - SST/ELI/ELIC - Earth & Climate, Andert, T. P., Rosenblatt, P., Pätzold, M., Häusler, B., Dehant, Véronique, Tyler, G. L., Marty, J. C., UCL - SST/ELI/ELIC - Earth & Climate, Andert, T. P., Rosenblatt, P., Pätzold, M., Häusler, B., Dehant, Véronique, Tyler, G. L., and Marty, J. C.

Published
2010

49. The structure of Venus’ middle atmosphere and ionosphere

Author

UCL - SST/ELI/ELIC - Earth & Climate, Pätzold, M., Häusler, B., Bird, M. K., Tellmann, S., Mattei, R., Asmar, S. W., Dehant, Véronique, Eidel, W., Imamura, T., Simpson, R. A., Tyler, G. L., UCL - SST/ELI/ELIC - Earth & Climate, Pätzold, M., Häusler, B., Bird, M. K., Tellmann, S., Mattei, R., Asmar, S. W., Dehant, Véronique, Eidel, W., Imamura, T., Simpson, R. A., and Tyler, G. L.

Published
2007

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