The Parent Asteroids of Ordinary Chondrite Meteorites

Details The Parent Asteroids of Ordinary Chondrite Meteorites The Parent Asteroids of Ordinary Chondrite Meteorites

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..167b&link_type=abstract

Lunar and Planetary Science, volume 27, page 167

Mathematics

Logic

1

Alteration, Asteroids, Chondrites: Ordinary, Regolith

Scientific paper

Ordinary chondrites account for 80% of meteorite falls, but twenty years of searching have found only a very few direct spectral matches between OC's and asteroids. Those asteroids that do match are small, rare, and all but one are in the planet crossing asteroid population. The one OC match in the main belt, 3628 Boznemcova, is very small (7 km) and the only OC found out of a thousand asteroids examined by the Binzel et al. search. Why can't we find a large reservoir of ordinary chondrite parent bodies? The three commonly cited theories on OC parent bodies each have their flaws. Bell's approach, that OC's have been smashed by collisional evolution into fragments smaller than 10 km diameter has not been supported by the results of the extensive Binzel search. Chapman has suggested that the S-asteroids may be OC's that have "space weathered". S-asteroids are abundant and have "approximately" OC-like albedo and spectral features. But the work of Gaffey et al. has shown that the S class is really a grab-bag of radically different mineralogies and only the S(IV) subclass has OC-like mineralogies. In addition, extensive spectral and petrologic work with regolith OC's and space weathering experiments with OC material have shown that OC's do not "space weather" to match the spectral features of S-asteroids. But S(IV)/OC link also has several problems: (1) S asteroids have weaker absorption bands than OC's; (2) S asteroids have a much stronger spectral "red" slope from 0.6 to 1.6 microns; (3) S asteroids have a characteristic "leveling off" of the spectral slope longwards of 1.6 microns.

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