The 1.7- to 4.2-micron spectrum of asteroid 1 Ceres - Evidence for structural water in clay minerals

Details The 1.7- to 4.2-micron spectrum of asteroid 1 Ceres - Evidence for structural water in clay minerals The 1.7- to 4.2-micron spectrum of asteroid 1 Ceres - Evidence for structural water in clay minerals

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...48..453l&link_type=abstract

Icarus, vol. 48, Dec. 1981, p. 453-459.

Astronomy and Astrophysics

Astronomy

77

Absorption Spectra, Astronomical Photometry, Ceres Asteroid, Infrared Spectra, Molecular Spectra, Spectrophotometry, Water, Chemical Composition, Clays, High Resolution, Hydration, Hydroxyl Emission, Montmorillonite, Spectral Reflectance, Spectral Resolution, Asteroids, Ceres, Water, Clays, Minerals, Spectra, Spectrophotometry, Absorption, Hydration, Comparisons, Oh Radical, Ice, Wavelengths, Reflectance, Earth-Based Observations

Scientific paper

A 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.

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