An infrared reflectance study of low albedo surface constituents

Details An infrared reflectance study of low albedo surface constituents An infrared reflectance study of low albedo surface constituents

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..271l&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 271-273 (SEE N92-10728 01-91)

Physics

Geophysics

Albedo, Asteroid Belts, Asteroids, Meteorites, Reflectance, Silicates, Spectral Bands, Infrared Radiation, Water

Scientific paper

Observational testing of the idea that the distribution of water is the key to understanding the volatile content of the asteroid belt relies on the exploration of the 3 micron absorption feature in hydrated silicates - the only diagnostic spectral band evident in the dark, volatile rich CI and CM meteorites. The existence of the band has demonstrated the presence of hydrated silicates on asteroids. An example of this feature is shown in the spectrum of the CI meteorite Orgueil. The feature is characterized by a sharp reflectance drop at 2.7 microns, due to structural OH, and by an absorption due to H2O that decreases slowly out to about 3.5 microns. In their present observational program, researchers are expanding their observational program to include other low-albedo classes of asteroids - asteroids that range primarily from the middle and outer asteroid belt (greater than 2.5 AU) to the Trojan region at 5.2 AU. Preliminary results indicate that the outer belt and Trojan asteroids do not show feature diagnostic of hydrated silicates. Researchers conclude that these asteroids have not undergone the alteration processes that we see in C-class asteroids.

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