Is Vesta an intact and pristine protoplanet?

Consolmagno, G. J.; Golabek, G. J.; Turrini, D.; Jutzi, Martin; Sirono, S.; Svetsov, V.; Tsiganis, K. (2015). Is Vesta an intact and pristine protoplanet? Icarus, 254, pp. 190-201. Elsevier 10.1016/j.icarus.2015.03.029

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It is difficult to find a Vesta model of iron core, pyroxene and olivine-rich mantle, and HED crust that can match the joint constraints of (a) Vesta's density and core size as reported by the Dawn spacecraft team; (b) the chemical trends of the HED meteorites, including the depletion of sodium, the FeO abundance, and the trace element enrichments; and (c) the absence of exposed mantle material on Vesta's surface, among Vestoid asteroids, or in our collection of basaltic meteorites. These conclusions are based entirely on mass-balance and density arguments, independent of any particular formation scenario for the HED meteorites themselves. We suggest that Vesta either formed from source material with non-chondritic composition or underwent after its formation a radical physical alteration, possibly caused by collisional processes, that affected its global composition and interior structure. (C) 2015 Elsevier Inc. All rights reserved.

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