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Phyllosilicate absorption features in main-belt and outer-belt asteroid reflectance spectraAbsorption features having depths up to 5 percent are identified in high-quality, high-resolution reflectance spectra of 16 dark asteroids in the main belt and in the Cybele and Hilda groups. Analogs among the CM2 carbonaceous chondrite meteorites exist for some of these asteroids, suggesting that these absorptions are due to iron oxides in phyllosilicates formed on the asteroidal surfaces by aqueous alteration processes. Spectra of ten additional asteroids, located beyond the outer edge of the main belt, show no discernible absorption features, suggesting that aqueous alteration did not always operate at these heliocentric distances.
Document ID
19900028652
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Vilas, Faith
(NASA Johnson Space Center Houston, TX, United States)
Gaffey, Michael J.
(Rensselaer Polytechnic Institute, Troy, NY, United States)
Date Acquired
August 14, 2013
Publication Date
November 10, 1989
Publication Information
Publication: Science
Volume: 246
ISSN: 0036-8075
Subject Category
Lunar And Planetary Exploration
Accession Number
90A15707
Funding Number(s)
CONTRACT_GRANT: NAGW-642
Distribution Limits
Public
Copyright
Other

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