Visual and Infrared Photometry of the Icy Satellites of Saturn with the Cassini Visual Infrared Mapping Spectrometer (VIMS)

Details Visual and Infrared Photometry of the Icy Satellites of Saturn with the Cassini Visual Infrared Mapping Spectrometer (VIMS) Visual and Infrared Photometry of the Icy Satellites of Saturn with the Cassini Visual Infrared Mapping Spectrometer (VIMS)

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6906b&link_type=abstract

American Astronomical Society, DPS meeting #38, #69.06; Bulletin of the American Astronomical Society, Vol. 38, p.621

Astronomy and Astrophysics

Astronomy

1

Scientific paper

During the first two years of its mission, the Cassini-Huygens spacecraft executed 9 close flybys of the icy satellites of Saturn. Phoebe, Iapetus, Tethys, Dione, Rhea, and Hyperion have been closely scrutinized by a targeted or close serendipitous encounter, while Enceladus has been visited three times at distances of 1200 km or less. In addition, there have been several "Voyager class” encounters of these same satellites plus Mimas, and numerous distant encounters. The Cassini Visual Infrared Mapping Spectrometer (VIMS) is an imaging instrument that returns data between 0.34 and 5.1 microns. Spatial resolution is as high as 0.25 mradians in the 1-5 micron region and 0.17 mradians in the visible. This unprecedented range in wavelength is coupled with a vastly improved range of solar phase angles obtained during the orbital tour. Rhea is particularly well-covered with a full excursion in solar phase angles from 20-160 degrees and some additional data at opposition. Disk integrated solar phase curves and disk-resolved maps of albedo have been produced for the major satellites. Separate solar phase curves of the high albedo and low albedo hemispheres of Iapetus have also been obtained. Disk-resolved measurements of the satellites have been combined with integral solar phase curves and modeled to derive the physical properties of the surface, including macroscopic roughness and surface particle sizes.
Work funded by NASA.

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