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Hydrated Minerals on Asteroids: The Astronomical RecordKnowledge of the hydrated mineral inventory on the asteroids is important for deducing the origin of Earth's water, interpreting the meteorite record, and unraveling the processes occurring during the earliest times in solar system history. Reflectance spectroscopy shows absorption features in both the 0.6-0.8 and 2.5-3.5-micron regions, which are diagnostic of or associated with hydrated minerals. Observations in those regions show that hydrated minerals are common in the mid-asteroid belt, and can be found in unexpected spectral groupings as well. Asteroid groups formerly associated with mineralogies assumed to have high-temperature formation, such as M- and E-class steroids, have been observed to have hydration features in their reflectance spectra. Some asteroids have apparently been heated to several hundred degrees Celsius, enough to destroy some fraction of their phyllosilicates. Others have rotational variation suggesting that heating was uneven. We summarize this work, and present the astronomical evidence for water- and Hydroxl-bearing minerals on asteroids.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Rivkin, A. S.
(Massachusetts Inst. of Tech. MA United States)
Howell, E. S.
(Arecibo Ionospheric Observatory Arecibo, Puerto Rico)
Vilas, F.
(NASA Johnson Space Center Houston, TX United States)
Lebofsky, L. A.
(Arizona Univ. AZ United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.

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