The Cassini mission has made several flybys of Saturn's second largest moon, Rhea. Do we have any data about that moon's surface geochemistry? I do know there is a thin Oxygen/Carbon Dioxide atmosphere and that the planet is 75/25 ice/rock.
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2Plenty: VIMS coverage of Saturn’s icy satellite Rhea, Formation, Distribution and Loss of Rhea’s O2-CO2 Exosphere, Near-infrared spectroscopy of Mimas, Enceladus, Tethys, and Rhea, A spectroscopic study of the surfaces of Saturn’s large satellites: H2O ice, tholins, and minor constituents... – TildalWave May 09 '14 at 02:29
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1...Differentiation and mineralogy of Rhea, Saturn’s Icy Moon Rhea: a Prediction for its Bulk Chemical Composition and Physical Structure, Cassini RADAR observations of Enceladus, Tethys, Dione, Rhea, Iapetus, Hyperion, and Phoebe, and I would also suggest searching for Planetary and Space Science's "Surfaces, atmospheres and magnetospheres of the outer planets and their satellites and ring systems" – TildalWave May 09 '14 at 02:34
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The latter series of papers are sadly paywalled, all other links are to PDF documents. Are you interested in anything specific regarding Rhea's surface geochemistry, or just a general overview? – TildalWave May 09 '14 at 02:41
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@TidalWave: Thanks for your responses. I was wondering if there was a consensus yet about the presence of Ammonia in the ice. I assumed the surface material is carbon-bearing silicates, but the reports seem to indicate higher abundances of metals than I originally thought. A nice surprise, if it turns out to be true. . . My reason for interest is to evaluate Rhea as a possible staging base for exploring the Saturn system. – MercuryPlus May 09 '14 at 15:32