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In page Natural satellite:

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Neptune's moon Proteus is the largest irregularly shaped natural satellite, and is about as large as an icy moon can become before becoming relaxed into a spheroidal shape.[1] The shapes of moons in synchronous orbit are expected to asymptotically change shape into rounded ellipsoids under hydrostatic equilibrium, although this may not happen in the age of the Solar System. For example, the larger Saturnian moons are in equilibrium, while Iapetus, Mimas, and Enceladus are apparently not.[2][3] The "round/rounded satellites" are sometimes categorized as planetary-mass moons. The shapes of Eris' moon Dysnomia and Orcus' moon Vanth are presently unknown, although Dysnomia's density is high enough that it is probably a solid ellipsoid as well.[citation needed]