Space Weathering Alteration Of V Type Basaltic Asteroids

Details Space Weathering Alteration Of V Type Basaltic Asteroids Space Weathering Alteration Of V Type Basaltic Asteroids

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3931d&link_type=abstract

American Astronomical Society, DPS meeting #42, #39.31

Astronomy and Astrophysics

Astronomy

Scientific paper

Basaltic asteroids are mainly found in the inner main belt except for few
exceptions in the outer belt and near-Earth space. These asteroids -referred as V-types- have surface compositions that resembles that of Vesta. A number of evidences suggest that some V-types are genetically related to Vesta. In particular, several V-types belong to Vesta's dynamical family. Moreover, Vesta is one of the few asteroids to have been identified as source of a specific class of meteorites (HEDs). Despite the general consensus on the outlined scenario, several questions remain
unresolved. In particular, it is not clear if the spectral diversity of Vesta, V-types and HEDs is due to space weathering alteration, like for
S-type asteroids. Here, SDSS photometry of candidate V-types is used to study to find clues that support or reject the presence of space weathering on V-type asteroids. We show that visible spectral slopes of V-types are systematically redder with respect to HEDs, in a similar way to what found for ordinary condrite meteorites and S-types. In the assumption that space weathering is responsible of the slope mismatch, we estimated an upper limit for the reddening timescale of about 0.5 Ga. Nevertheless, the observed slope mismatch between HEDs and V-types poses several
puzzles to understanding its origin.
The implication of our findings are discussed also in the context of Dawn mission to Vesta.

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