A model for the interior structure, evolution, and differentiation of Callisto

Computer Science

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Scientific paper

The recently measured dimensionless moment of inertia (MoI) factor for Callisto of 0.3549 ± 0.0042 (Anderson et al. 2001) poses a problem: Its value cannot be explained by a model in which Callisto is completely differentiated into an ice shell above a rock shell and an iron core such as its neighboring satellite Ganymede nor can it be explained by a model of a homogeneous, undifferentiated ice-rock satellite. We show that Callisto may be incompletely differentiated into an about 100 km thick outer ice-rock shell in which the volumetric rock concentration is close to the primordial one, an ice mantle mostly depleted of rock, and an about 1800 km rock-ice core in which the rock concentration is close to the close-packing limit. We show that if Callisto accreted from a mix of metal bearing rock and ice and if the average size of the rocks was of the order of meters to tens of meters, then Callisto may have experienced a gradual, but still incomplete unmixing of the two components.

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