Is the U-B color sufficient for identifying water of hydration on solar system bodies?

Details Is the U-B color sufficient for identifying water of hydration on solar system bodies? Is the U-B color sufficient for identifying water of hydration on solar system bodies?

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995icar..115..217v&link_type=abstract

Icarus (ISSN 0019-1035), vol. 115, no. 1, p. 217-218

Astronomy and Astrophysics

Astronomy

5

Asteroids, Color-Magnitude Diagram, Hydration, Predictions, Ubv Spectra, Water, Albedo, Iron, Photometry, Sky Surveys (Astronomy), Surface Layers, Surface Temperature

Scientific paper

The U-B color has been suggested as a predictor of the presence of water of hydration on asteroids. Photometry from the Eight-Color Asteroid Survey (ECAS) was used to test this concept. An overlap in U-B color prevents this magnitude difference from distinguishing between surface material that was thermally processed at higher temperatures and surface material that was aqueously altered. Two tests of the presence of water of hydration using visible spectral region photometry failed to flag those few higher albedo M- and E-class asteroids having photometry that shows a 3.0-micrometers water of hydration absorption. These asteroids probably contain little or no oxidized iron in their surface material.

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