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Chemical and phase composition of Enceladus: Insights from Cassini data

Compositional information obtained with Cassini instruments during Enceladus and Saturn’s E ring flybys is used to constrain chemical and phase (minerals, ices, clathrates, organics, liquids) composition of the moon’s interior. The Enceladus’ plume emits cometary-type (NH3, HCN, CH4) likely primordial gases together with aqueously formed species (Na salts, silica and H2). This could indicate aqueous-assistant differentiation of the comet-like moon with preservation of some primordial icy materials. Although the compositional data do not provide unequivocal evidence for a present liquid water reservoir that supply plume components, aqueous sources are possible.