Outer Main Belt asteroids: Identification and distribution of four 3-μm spectral groups

Abstract This paper examines the distribution and the abundance of hydrated minerals (any mineral that contains H 2 O or OH) on outer Main Belt asteroids spanning the 2.5  a a a a a 2 O ice. A similar rounded 3-μm feature was also identified in 24 Themis and 65 Cybele. Unlike the sharp group, the rounded group did not experience aqueous alteration. Of the asteroids observed in this study, 140 Siwa, a P-type, is the only one that does not exhibit a 3-μm feature. These results are important to constrain the nature and the degree of aqueous alteration in outer Main Belt asteroids.

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