Spectral affinities in the icy moons of Saturn investigated through the G-mode multivariate classification method

Details Spectral affinities in the icy moons of Saturn investigated through the G-mode multivariate classification method Spectral affinities in the icy moons of Saturn investigated through the G-mode multivariate classification method

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p32a..05t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P32A-05

Other

5410 Composition (1060, 3672), 5421 Interactions With Particles And Fields, 5464 Remote Sensing, 5470 Surface Materials And Properties

Scientific paper

Among the icy satellites of Saturn, Iapetus shows a unique dichotomy in the solar system, its leading hemisphere being significantly darker than the trailing hemisphere. Understanding the source of the dark material coating one side of Iapetus is a focus in the Cassini mission. Assuming an exogenous origin of this material, in different past times, and for different reasons, two satellites of Saturn were indicated as possible sources of this dark material: Phoebe and Hyperion, besides other little dark irregular satellites. In this work, we analysed the data collected by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini Orbiter spacecraft, relative to the best to-date flybys with Phoebe, Iapetus and Hyperion, in order to search for spectral affinities among these bodies. The whole VIMS spectral range is explored: reflectances of the visible portion of the data and the strengths of the most diagnostic absorption bands occurring in the infrared portion are used as variables, along with their estimated errors, in order to produce an aggregate data set, that we process using the G-mode multivariate classification method to identify homogeneous taxonomic units in the multivariate space of the samples. To enforce the spectral results, we also carried out a new dynamical study focused on the efficiency of the dust migration and capture process by Iapetus, keeping into account the most recent results of the Cassini mission. Through this work we gain more insight about the nature of the Saturn environment.

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