Based on radio tracking of the Cassini spacecraft, we present a preliminary estimate of the gravity field of Saturn's mid-sized icy moon Dione. Combining this [1–5] with a shape model based on limb profile analyses [6,7], we conclude that Dione is differentiated, with a preferred moment of inertia of ~0.33MR^2, and that its ~300 meters of non-hydrostatic degree-2 topography may be isostatically compensated, consistent with the presence of an internal ocean.
Hemingway, D.J., Zannoni, M., Tortora, P., Nimmo, F., Asmar, S.W. (2016). Dione's Internal Structure Inferred from Cassini Gravity and Topography.
Dione's Internal Structure Inferred from Cassini Gravity and Topography
ZANNONI, MARCO;TORTORA, PAOLO;
2016
Abstract
Based on radio tracking of the Cassini spacecraft, we present a preliminary estimate of the gravity field of Saturn's mid-sized icy moon Dione. Combining this [1–5] with a shape model based on limb profile analyses [6,7], we conclude that Dione is differentiated, with a preferred moment of inertia of ~0.33MR^2, and that its ~300 meters of non-hydrostatic degree-2 topography may be isostatically compensated, consistent with the presence of an internal ocean.File in questo prodotto:
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