Abstract
We present visible and near-infrared reflectance spectra and interpreted surface mineralogy for asteroid 10537 (1991 RY16). The spectrum of this object is without precedent among the main-belt asteroids. A unique absorption band centered at 0.63 mm could be attributed to one of several mineralogies. Pronounced 1 and 2 mm absorption bands suggest that the composition of 10537 is a mixture of pyroxenes and olivine and that it originated from a parent body that was partially or fully differentiated. The closest available analog is the large main-belt asteroid 349 Dembowska, but 10537 may be an isolated fragment from a completely eroded parent body. Subject headings: minor planets, asteroids — solar system: formation
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