Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1387w&link_type=abstract
Lunar and Planetary Science, volume 27, page 1387
Computer Science
5
Dust: Impact-Generated, Iras Dust Band, Oblique Impact, Vesta
Scientific paper
Spectroscopic studies by Binzel and Xu showed that a large fraction of the asteroids linked to Vesta on the basis of similar orbits share Vesta's unique, sharply defined basaltic reflection spectrum. These asteroids, which we will call vestoids, have diameters 10 km. Galileo studies of Gaspra and Ida show that spectral properties of FeO-rich surfaces degrade quickly; it appears that an ordinary-chondrite surface may resemble a typical S-asteroid within about 100 Ma, and the degradation of FeO-rich basaltic surfaces would be comparable. It follows that the nearly unweathered surfaces of Vesta and the vestoids may be <10 Ma old, in which case the vestoids were probably formed in the same collisional event that resurfaced Vesta. The semimajor axes of the vestoid orbits show a remarkably wide range from smaller than that of Vesta at 2.36 AU to 2.47 AU, near the 3:1 period resonance with Jupiter that appears to be responsible for bringing most stony meteorites from the Asteroid Belt to Earth.
Chapman Clark R.
Dermott Stanley F.
Grogan Keith
Wasson John T.
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