Discovery and Analysis of Minor Absorption Bands in S-Asteroid Visible Reflectance Spectra

Mathematics – Logic

Scientific paper

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Scientific paper

Two minor absorption bands in the visible range of the S-class asteroid reflectance spectra have been discovered. The CCD reflectance spectra of 10 S asteroids were deconvolved using the modified Gaussian model, and 9 of them are shown to have two minor absorption bands centered around 0.60 and 0.67 μm in wavelength. Among the tested common geologic minerals, the obtained absorption-band centers and widths of the S asteroids were most consistent with those of oxidized Fe-Ni metal and spinel-group minerals. These results are consistent with the idea that the S asteroids are made of stony-iron-like material and the recent identification of two spinel-bearing S asteroids based on the comparison of the 1- and 2-μm band strengths. Because both oxidized iron compounds and spinel-group minerals have spectral features very different from the S-asteroid ones in a wider wavelength region, they must be at most minor constituents in the S-asteroid surface regoliths.

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