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Dione's leading/trailing dichotomy at 2.2 cm

Abstract : The surface of Dione, Saturn’s fourth-largest moon, is affected by a variety of processes, both exogenic and endogenic, although the satellite does not seem to be active today [e.g., 1]. Like its neighboring mid-sized icy airless satellites Tethys and Rhea, it exhibits a leading/trailing dichotomy, observed at UV to IR wavelengths [e.g., 2]. This dichotomy has also been reported at 2.2 cm wavelengths, in the unique resolved observation acquired by the Cassini Radar on Dione [3, Fig. 1b]. The leading hemisphere is more radar-bright than the trailing hemisphere, implying greater water ice purity on the leading side. This asymmetry may be caused by the deposition of E-ring material on the leading side, and/or by contamination by a non-icy material on the trailing side. Herein, we examine Cassini radiometry observations of Dione.
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Léa Bonnefoy, Alice Le Gall, Marie Azevedo, Emmanuel Lellouch, Cédric Leyrat, et al.. Dione's leading/trailing dichotomy at 2.2 cm. Europlanet Science Congress EPSC 2020, Sep 2020, Virtual Meeting, Germany. pp.EPSC2020-329. ⟨insu-02943256⟩

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