Origin of Basaltic Asteroids in the Main Asteroid Belt

Details Origin of Basaltic Asteroids in the Main Asteroid Belt Origin of Basaltic Asteroids in the Main Asteroid Belt

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5005r&link_type=abstract

American Astronomical Society, DPS meeting #39, #50.05; Bulletin of the American Astronomical Society, Vol. 39, p.512

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Asteroid (4) Vesta, located in the inner asteroid belt, is the only known large asteroid currently showing a basaltic crust, implying that it underwent mineralogical differentiation. It is associated to a large dynamical family that was formed by an impact excavating a crater on Vesta's surface. Since 2000, many small basaltic asteroids have been discovered that are not members of the Vesta family, raising the question of whether they are fragments from Vesta or from other differentiated bodies. We simulated the orbital evolution of 6600 test bodies with initial orbits within the Vesta family over 2 Gy, aiming to reproduce the dynamics of fragments ejected from Vesta's surface over the Vesta family age. Our model included gravitational perturbations of all planets except Mercury and the Yarkovsky effect. The results show that a large fraction of the original Vesta family members may evolve out of the family borders. We compared the distribution of our model fragments to that of the known basaltic asteroids outside the Vesta family to find that: (i) Most basaltic asteroids with a<2.3 AU are likely fugitives from the Vesta family that have evolved to their current orbits over the past 2 Gy through various identified dynamical pathways. (ii) Many basaltic asteroids with 2.3

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