HR: 12:05h
AN: P12B-08    [Abstracts]
TI: VIS-NIR Spectrophotometric Study of the Saturnian icy Satellites by Cassini-VIMS
AU: * Filacchione, G
EM: gianrico.filacchione@iasf-roma.inaf.it
AF: INAF-IASF, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Capaccioni, F
EM: fabrizio.capaccioni@iasf-roma.inaf.it
AF: INAF-IASF, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Tosi, F
EM: federico.tosi@iasf-roma.inaf.it
AF: INAF-IFSI, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Coradini, A
EM: angioletta.coradini@ifsi-roma.inaf.it
AF: INAF-IFSI, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Cerroni, P
EM: priscilla.cerroni@iasf-roma.inaf.it
AF: INAF-IASF, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Adriani, A
EM: alberto.adriani@ifsi-roma.inaf.it
AF: INAF-IFSI, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: McCord, T B
EM: mccordtb@aol.com
AF: Space Science Institute - Bear Fight Center, P.O. Box 667, Winthrop, WA 98862, United States
AU: Baines, K H
EM: kbaines@pop.jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Bellucci, G
EM: giancarlo.bellucci@ifsi-roma.inaf.it
AF: INAF-IFSI, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Brown, R H
EM: rhb@lpl.arizona.edu
AF: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721-0092, United States
AU: Bibring, J
EM: jean-pierre.bibring@ias.fr
AF: Institut d'Astrophysique Spatiale, Universite' de Paris, Bâtiment 121, Université Paris Sud 1, Orsay, 91405, France
AU: Buratti, B J
EM: bonnie.j.buratti@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Clark, R N
EM: rclark@usgs.gov
AF: U.S. Geological Survey, Denver Federal Center, West 6th Ave. & Kipling St., Lakewood, CO 80225, United States
AU: Combes, M
EM: michel.combes@obspm.fr
AF: Observatoire de Paris, 5, place Jules Janssen, Meudon, 92195, France
AU: Cruikshank, D P
EM: Dale.P.Cruikshank@nasa.gov
AF: NASA Ames Research Center, Moffett Field, Moffett Field, CA 94035, United States
AU: Formisano, V
EM: vittorio.formisano@ifsi-roma.inaf.it
AF: INAF-IFSI, via del Fosso del Cavaliere, 100, Rome, RM 00133, Italy
AU: Jaumann, R
EM: Ralf.Jaumann@dlr.de
AF: Deutsches Zentrum für Luft- und Raumfahrt (DLR), Rutherfordstraße 2, Berlin, 12489, Germany
AU: Langevin, Y G
EM: yves.langevin@ias.fr
AF: Institut d'Astrophysique Spatiale, Universite' de Paris, Bâtiment 121, Université Paris Sud 1, Orsay, 91405, France
AU: Matson, D L
EM: Dennis.L.Matson@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Mennella, V
EM: mennella@na.astro.it
AF: INAF, Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, Napoli, 80131, Italy
AU: Nelson, R M
EM: robert.m.nelson@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Nicholson, P D
EM: nicholson@astrosun.tn.cornell.edu
AF: Cornell University, Astronomy Department, 610 Space Science Building, Ithaca, NY 14853, United States
AU: Sicardy, B
EM: bruno.sicardy@obspm.fr
AF: Observatoire de Paris, 5, place Jules Janssen, Meudon, 92195, France
AU: Sotin, C
EM: Christophe.Sotin@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Sotin, C
EM: Christophe.Sotin@jpl.nasa.gov
AF: Laboratoire de Planetologie et Geodynamique, Universite' de Nantes, 2, rue de la Houssinière, Nantes, 44322, France
AB: After the first three years of the nominal mission aboard the Cassini probe the VIMS (Visual and Infrared Mapping Spectrometer) experiment has collected more than one thousand useful full-disk observations of both regular (Mimas, Enceladus, Tethys, Dione, Rhea, Hyperion, Iapetus, Phoebe) and minor (Atlas, Prometheus, Pandora, Janus, Epimetheus, Telesto, Calypso) icy moons of Saturn. These data, acquired from a variety of distances and inclinations from the equatorial plane, with different phase angles and hemispheric coverage, are analyzed by using several spectroscopic indicators (I/F continuum level, slopes, bands strengths) in order to identify analogies and differences in the compositional units of satellites and derive the phase curves at different longitudes; many observations acquired close to zero phase angle allow us to measure the opposition surge effect on several satellites. Concerning the composition we have derived the distribution of the water ice abundance and grain size from the almost pure icy surfaces of Enceladus and Calypso to the organic rich Hyperion, Iapetus and Phoebe. We report about the differences observed in the CO₂ band position which is shifted at shorter wavelengths on Hyperion respect to Phoebe and Iapetus; this effect is probably related to a different distribution of clathrates on these icy surfaces. This research was completed thanks to the support of the Italian Space Agency (ASI).
DE: 6280 Saturnian satellites
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting