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Abstract

Spectra obtained from recent telescopic observation of 1-Ceres and laboratory measurements and theoretical calculations of three component mixtures of Ceres analog material suggest that an ammoniated phyllosilicate is present on the surface of the asteroid, rather than H2O frost as had been previously reported. The presence of an ammoniated phyllosilicate, most likely ammoniated saponite, on the surface of Ceres implies that secondary temperatures could not have exceeded 400 kelvin.

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References

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Published In

Science
Volume 255 | Issue 5051
20 March 1992

Submission history

Received: 13 November 1991
Accepted: 3 February 1992
Published in print: 20 March 1992

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Authors

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Trude V. V. King
U.S. Geological Survey, Denver, CO 80225
R. N. Clark
U.S. Geological Survey, Denver, CO 80225
W. M. Calvin
U.S. Geological Survey, Denver, CO 80225
D. M. Sherman
U.S. Geological Survey, Denver, CO 80225
R. H. Brown
Jet Propulsion Laboratory, Pasadena, CA 91109

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