201. Surface composition of Hyperion
- Author
-
Jean-Pierre Bibring, R. N. Clark, Angioletta Coradini, Yves Langevin, Dale P. Cruikshank, P. D. Nicholson, B. J. Buratti, Robert H. Brown, Bruno Sicardy, T. B. McCord, Katrin Stephan, Priscilla Cerroni, Vittorio Formisano, Gianrico Filacchione, Giancarlo Bellucci, Amanda R. Hendrix, Kevin H. Baines, Dennis L. Matson, Allan W. Meyer, Robert M. Nelson, Pierre Drossart, J. B. Dalton, M. Combes, James M. Bauer, Christophe Sotin, Candice Hansen, C. M. Dalle Ore, Fabrizio Capaccioni, Vito Mennella, Federico Tosi, Ralf Jaumann, Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), SETI Institute, NASA Ames Research Center, Moffett Field, Search for Extraterrestrial Intelligence Institute (SETI), Jet Propulsion Laboratory, California Institute of Technology (JPL), Department of Planetary Exploration, DLR, Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-Roma), US Geological Survey, Denver, Lunar and Planetary Laboratory [University of Arizona] (LPL), University of Arizona, Space Science Institute, Winthrop, Department of Astronomy, Cornell University, Université de Nantes (UN), Universities Space Research Association - Stratospheric Observatory for Infrared Astronomy (USRA -SOFIA), Istituto di Fisica dello Spazio Interplanetario (IFSI), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Departement de recherche SPAtiale (DESPA), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), 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), Institut d'astrophysique spatiale (IAS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), and INAF-Osservatorio Astronomico di Capodimonte (INAF-OAC)
- Subjects
Surface (mathematics) ,010504 meteorology & atmospheric sciences ,Rotation ,01 natural sciences ,Spectral line ,Icy Satellites ,[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology ,Impact crater ,Saturn ,0103 physical sciences ,VIMS ,010303 astronomy & astrophysics ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Remote sensing ,Multidisciplinary ,Spacecraft ,business.industry ,Albedo ,13. Climate action ,Cassini ,Satellite ,business ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Hyperion ,Geology - Abstract
International audience; Hyperion, Saturn's eighth largest icy satellite, is a body of irregular shape in a state of chaotic rotation. The surface is segregated into two distinct units. A spatially dominant high-albedo unit having the strong signature of H2O ice contrasts with a unit that is about a factor of four lower in albedo and is found mostly in the bottoms of cup-like craters. Here we report observations of Hyperion's surface in the ultraviolet and near-infrared spectral regions with two optical remote sensing instruments on the Cassini spacecraft at closest approach during a fly-by on 25-26 September 2005. The close fly-by afforded us the opportunity to obtain separate reflectance spectra of the high- and low-albedo surface components. The low-albedo material has spectral similarities and compositional signatures that link it with the surface of Phoebe and a hemisphere-wide superficial coating on Iapetus.
- Published
- 2007