Reference : The remarkable surface homogeneity of the Dawn mission target (1) Ceres
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/107598
The remarkable surface homogeneity of the Dawn mission target (1) Ceres
English
Carry, Benoît [European Space Astronomy Centre, ESA, P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain; LESIA, Observatoire de Paris Meudon - CNRS, 5 place Jules Janssen, 92195 Meudon Cedex, France]
Vernazza, Pierre [European Southern Observatory, K. Schwarzschild-Str. 2, 85748 Garching, Germany; Laboratoire dAstrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille, France]
Dumas, Christophe [European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile]
Merline, William J [Southwest Research Institute, 1050 Walnut St. # 300, Boulder, CO 80302, USA]
Mousis, Olivier [Université de Franche Comté - CNRS, Institut UTINAM, 41 bis av. de l'Observatoire, F-25010 Besançon Cedex, France]
Rousselot, Philippe [Université de Franche Comté - CNRS, Institut UTINAM, 41 bis av. de l'Observatoire, F-25010 Besançon Cedex, France]
Jehin, Emmanuel mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
Manfroid, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)]
Fulchignoni, Marcello [LESIA, Observatoire de Paris Meudon - CNRS, 5 place Jules Janssen, 92195 Meudon Cedex, France]
Zucconi, Jean*-Marc [Université de Franche Comté - CNRS, Institut UTINAM, 41 bis av. de l'Observatoire, F-25010 Besançon Cedex, France; Deceased.]
1-Jan-2012
Icarus
217
20-26
Yes (verified by ORBi)
International
0019-1035
[en] Dwarf-planet (1) Ceres is one of the two targets, along with (4) Vesta, that will be studied by the NASA Dawn spacecraft via imaging, visible and near-infrared spectroscopy, and gamma-ray and neutron spectroscopy. While Ceres' visible and near-infrared disk-integrated spectra have been well characterized, little has been done about quantifying spectral variations over the surface. Any spectral variation would give us insights on the geographical variation of the composition and/or the surface age. The only work so far was that of Rivkin and Volquardsen ([2010], Icarus 206, 327) who reported rotationally-resolved spectroscopic (disk-integrated) observations in the 2.2-4.0 μm range; their observations showed evidence for a relatively uniform surface.Here, we report disk-resolved observations of Ceres with SINFONI (ESO VLT) in the 1.17-1.32 μm and 1.45-2.35 μm wavelength ranges. The observations were made under excellent seeing conditions (0.6″), allowing us to reach a spatial resolution of ˜75 km on Ceres' surface. We do not find any spectral variation above a 3% level, suggesting a homogeneous surface at our spatial resolution. Slight variations (about 2%) of the spectral slope are detected, geographically correlated with the albedo markings reported from the analysis of the HST and Keck disk-resolved images of Ceres (Li et al. [2006], Icarus 182, 143; Carry et al. [2008], Astron. Astrophys. 478, 235). Given the lack of constraints on the surface composition of Ceres, however, we cannot assert the causes of these variations.
Researchers
http://hdl.handle.net/2268/107598
10.1016/j.icarus.2011.10.015
http://adsabs.harvard.edu/abs/2012Icar..217...20C
http://de.arxiv.org/abs/1110.4712

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