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Phobos and Deimos

FOS spectra of Phobos, Deimos, 702 Alauda (a C-type asteroid) 1144 Oda (a D-type asteroid) and Hya VB64 (a solar-type star) were obtained ( Zellner, 1994)over a wavelength range of 0.21 to 0.80 microns with spectral resolution ranging from 3 at 0.21 m to 200 at 0.8 m. There is considerable similarity between the spectra of Phobos and Deimos and the redder D-type asteroids, which are rare in the inner solar system. This could indicate that the martian satellites may have formed in the outer asteroid belt and that their interiors may contain water ice and primordial organic compounds.



U.S. National Report to IUGG, 1991-1994
Rev. Geophys. Vol. 33 Suppl., © 1995 American Geophysical Union