Dawn at Vesta: testing the protoplanetary paradigm

Science
C T RussellT N Titus

Abstract

The Dawn spacecraft targeted 4 Vesta, believed to be a remnant intact protoplanet from the earliest epoch of solar system formation, based on analyses of howardite-eucrite-diogenite (HED) meteorites that indicate a differentiated parent body. Dawn observations reveal a giant basin at Vesta's south pole, whose excavation was sufficient to produce Vesta-family asteroids (Vestoids) and HED meteorites. The spatially resolved mineralogy of the surface reflects the composition of the HED meteorites, confirming the formation of Vesta's crust by melting of a chondritic parent body. Vesta's mass, volume, and gravitational field are consistent with a core having an average radius of 107 to 113 kilometers, indicating sufficient internal melting to segregate iron. Dawn's results confirm predictions that Vesta differentiated and support its identification as the parent body of the HEDs.

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Citations

May 15, 2012·Science·S MarchiC T Russell
May 15, 2012·Science·R JaumannH Sierks
May 15, 2012·Science·Paul SchenkChris Russell
Sep 22, 2012·Science·Thomas H PrettymanChristopher T Russell
Oct 16, 2012·Science·Roger R FuAaron T Kuan
Sep 22, 2012·Science·Richard P Binzel
Jul 17, 2014·Proceedings of the National Academy of Sciences of the United States of America·Masaaki MiyaharaNaohisa Hirao
Mar 15, 2015·Proceedings of the National Academy of Sciences of the United States of America·Stephen Ornes
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Nov 8, 2013·Nature·E AmmannitoJ M Sunshine
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Apr 19, 2017·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Adam R SarafianEmily Sarafian
Mar 12, 2020·Nature Communications·Ai-Cheng ZhangHisayoshi Yurimoto
Oct 10, 2020·Science·D N DellaGiustinaD S Lauretta
Oct 10, 2020·Science Advances·D J ScheeresD S Lauretta
Aug 17, 2018··Scott M. LindauerJonathan E. Kollmer

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