Reports

Compositional Structure of the Asteroid Belt

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Science  25 Jun 1982:
Vol. 216, Issue 4553, pp. 1405-1407
DOI: 10.1126/science.216.4553.1405

Abstract

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.