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Geomorphology of 21 Lutetia from Rosetta/OSIRIS Observations

Thomas, Nicolas and Barbierie, C. and Barucci, A. M. and Besse, S. and Cremonese, G. and Da Deppo, V. and Debei, S. and Ferri, F. and Groussin, O. and Hviid, S. F. and Jorda, L. and Keller, H. U. and Knollenberg, J. and Kührt, E. and Marchi, S. and Markiewicz, W. J. and Massironi, M. and Moissl, R. and Scholten, F. and Sierks, H. and Tubiana, C. and Vincent, J. and OSIRIS , Team (2010) Geomorphology of 21 Lutetia from Rosetta/OSIRIS Observations. In: Bulletin of the American Astronomical Society, 42, p. 1043. American Astronomical Society. 42nd DPS Meeting, 3.-8.10.2010, Pasadena, CA, USA.

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Abstract

The Rosetta spacecraft performed a fly-by of the asteroid, 21 Lutetia, on 10 July 2010. The closest approach (CA) distance was around 3160 km. The scientific imaging system, OSIRIS[1], acquired images throughout the fly-by through both its narrow-angle (NAC) and wide-angle (WAC) cameras. The highest spatial scale in the NAC was around 60 m px-1 (slightly higher spatial scale than the Galileo SSI at 243 Ida). At closest approach, the 100 km diameter asteroid filled the field of view of the NAC giving 2000 pixels across the object. The images reveal a remarkably diverse object characterized by the presence of geologically old surfaces, as witnessed by crater statistics, in close proximity to relatively recent, large impact craters. Grooves (aligned topographic structures) similar to but more weakly defined than those seen on the Martian moon, Phobos, are pervasive and are observed to cut many craters. Some are roughly concentric about the most recent impact craters, others are not. It is not clear, at this stage of the analysis, whether the most recent impacts were responsible for their production. Boulder fields with objects >200 m in diameter are evident. In the most extensive boulder field, the boulders appear to have been covered and possibly moved by landslides acting under the tenuous gravity. Downslope motion, indicative of destabilization through impact and seismic activity, has been observed on smaller bodies (e.g. Deimos and 433 Eros). Numerous unusual structures have also been observed although albedo markings, which cannot be attributed to topographic relief, are subtle and rare. The presentation will provide an overview of the highest resolution data and will detail some of these aspects. [1] Keller, H.U., and 68 colleagues, (2007), OSIRIS-The Scientific Camera System Onboard Rosetta, Space Sci. Rev., 128, 433-506.

Document Type:Conference or Workshop Item (Speech)
Title:Geomorphology of 21 Lutetia from Rosetta/OSIRIS Observations
Authors:
AuthorsInstitution or Email of Authors
Thomas, NicolasSpace and Planetary Sciences Division, University of Bern, Switzerland
Barbierie, C.University of Padova, Italy
Barucci, A. M.Observatoire de Paris, France
Besse, S.University of Maryland
Cremonese, G.University of Padova, Italy
Da Deppo, V.CNR-IFN UOS, Italy
Debei, S.CISAS - University of Padova, Italy
Ferri, F.University of Padova, Italy
Groussin, O.Laboratoire d'Astrophysique de Marseille, France
Hviid, S. F. Max-Planck-Institut fuer Sonnensystemforschung, Germany
Jorda, L.Laboratoire d'Astrophysique de Marseille, France
Keller, H. U.Institut fuer Geophysik und extraterrestrische Physik, Germany
Knollenberg, J.joerg.knollenberg@dlr.de
Kührt, E.ekkehard.kuehrt@dlr.de
Marchi, S.University of Padova, Italy
Markiewicz, W. J.Max-Planck-Institut fuer Sonnensystemforschung, Germany
Massironi, M.University of Padova, Italy
Moissl, R.Max-Planck-Institut fuer Sonnensystemforschung, Germany
Scholten, F.frank.scholten@dlr.de
Sierks, H.Max-Planck-Institut fuer Sonnensystemforschung, Germany
Tubiana, C.Max-Planck-Institut fuer Sonnensystemforschung, Germany
Vincent, J.Max-Planck-Institut fuer Sonnensystemforschung, Germany
OSIRIS , TeamUNSPECIFIED
Date:October 2010
Journal or Publication Title:Bulletin of the American Astronomical Society
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:42
Page Range:p. 1043
Publisher:American Astronomical Society
Status:Published
Keywords:OSIRIS, Rosetta, 21 Lutetia
Event Title:42nd DPS Meeting
Event Location:Pasadena, CA, USA
Event Type:international Conference
Event Dates:3.-8.10.2010
Organizer:American Astronomical Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Laura-Maria Brumm
Deposited On:10 Jan 2011 11:56
Last Modified:10 Jan 2011 11:56

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