VIS-NIR Spectrophotometric Study of the Saturnian icy Satellites by Cassini-VIMS

Details VIS-NIR Spectrophotometric Study of the Saturnian icy Satellites by Cassini-VIMS VIS-NIR Spectrophotometric Study of the Saturnian icy Satellites by Cassini-VIMS

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p12b..08f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P12B-08

Physics

6280 Saturnian Satellites

Scientific paper

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).

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