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The 1.7- to 4.2-micron spectrum of asteroid 1 Ceres - Evidence for structural water in clay mineralsA high-resolution Fourier spectrum (1.7-3.5 microns) and medium-resolution spectrophotometry (2.7-4.2 microns) were obtained for Asteroid 1 Ceres. The presence of the 3-micron absorption feature due to water of hydration was confirmed. The 3-micron feature is compared with the 3-micron bands due to water of hydration in clays and salts. It is concluded that the spectrum of Ceres shows a strong absorption at 2.7-2.8 microns due to structural OH groups in clay minerals. The dominant minerals on the surface of Ceres are therefore hydrated clay minerals structurally similar to terrestrial montmorillonites. There is also a narrow absorption feature at 3.1 microns which is attributable to a very small amount of water ice on Ceres. This is the first evidence for ice on the surface of an asteroid.
Document ID
19820044970
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lebofsky, L. A.
(Arizona Univ. Tucson, AZ, United States)
Feierberg, M. A.
(Arizona Univ. Tucson, AZ, United States)
Larson, H. P.
(Arizona Univ. Tucson, AZ, United States)
Johnson, J. R.
(Arizona, University Tucson, AZ, United States)
Tokunaga, A. T.
(Hawaii, University Honolulu, HI, United States)
Date Acquired
August 10, 2013
Publication Date
December 1, 1981
Publication Information
Publication: Icarus
Volume: 48
Subject Category
Lunar And Planetary Exploration
Accession Number
82A28505
Funding Number(s)
CONTRACT_GRANT: NSG-7114
CONTRACT_GRANT: NASW-3159
CONTRACT_GRANT: NSG-7607
Distribution Limits
Public
Copyright
Other

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