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Science 25 June 1982:
Vol. 216. no. 4553, pp. 1405 - 1407
DOI: 10.1126/science.216.4553.1405
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Articles

Compositional Structure of the Asteroid Belt

J. GRADIE 1 and E. TEDESCO 2

1 Laboratory for Planetary Studies, Cornell University, Ithaca, New York 14853
2 Lunar and Planetary Laboratory, University of Arizona, Tucson 84721

The distribution of compositional types among the asteroids is found to vary systematically with heliocentric distance. Seven distinct peaks in the relative proportion of the compositional types E, R, S, M, F, C, P, and D are found from 1.8 to 5.2 astronomical units. The inferred composition of the asteroids in each semimajor axis region is consistent with the theory that the asteroids accreted from the solar nebula at or near their present locations.

Submitted on November 20, 1981
Revised on March 22, 1982


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