The 0.43-micron Absorption Feature in Reflectance Spectra of Low-Albedo Asteroids

Details The 0.43-micron Absorption Feature in Reflectance Spectra of Low-Albedo Asteroids The 0.43-micron Absorption Feature in Reflectance Spectra of Low-Albedo Asteroids

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1025j&link_type=abstract

American Astronomical Society, DPS meeting #30, #07.P08; Bulletin of the American Astronomical Society, Vol. 30, p.1025

Physics

Geophysics

Scientific paper

A 0.43-micron absorption feature attributed to the (6) A1-->(4) A1, (4) E(G) Fe(3+) spin-forbidden crystal field transition has been identified in the reflectance spectra of some low-albedo asteroids (Vilas et al., 1993, Allen et al., 1996). Similar absorptions have been seen in terrestrial minerals such as the iron sulfate jarosite, though a strong UV IVCT absorption masks the 0.43-micron absorption feature in many minerals. We have reflectance spectra of over 50 asteroids covering 0.43-micron . Of these spectra, one-third of the asteroids have data taken on multiple dates, illustrating the repeatability of the feature. These spectra emphasize (but are not exclusively) low-albedo asteroids located in the outer part of the main asteroid belt and the outer asteroid belt (<=5.2 AU). This weak absorption feature is centered near 0.43-micron , overlying the solar G line also centered here, however the solar G line is narrower than the 0.43-micron absorption feature. We are evaluating the spectra to confirm and refine the presence of the 0.43-micron absorption feature and to insure it is not confused with residual absorptions that could be created by incomplete removal of the solar G line. Any correlation of the 0.43-micron absorption feature with the 0.7-micron absorption feature attributed to an Fe(2+) --> Fe(3+) charge transfer band in oxidized iron in phyllosilicates, and with asteroid class, will be presented. [This research is supported by the NASA Planetary Astronomy Program (FV) and by NASA Planetary Geology and Geophysics Grant NAGW-642 (MJG).]

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