Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..278...11c&link_type=abstract
Solar System Remote Sensing, p. 11
Astronomy and Astrophysics
Astronomy
Asteroids, Space Weathering, Absorption Spectroscopy, Meteoritic Composition, Meteorite Parent Bodies, Mineralogy, Spectral Reflectance, Remote Sensing
Scientific paper
Efforts to measure the colors of asteroids date back at least as far as the 1920s, when Bobrovnikoff's spectroscopy actually yielded Vesta's rotation period based on cyclical changes in its reflectance spectrum. There were several efforts in the 1940s and 1950s to compare asteroid colors with laboratory measurements of meteorite colors. They proved inconclusive for several reasons, including (a) the blandness of mineral spectra in the short-wavelength bands commonly used in astronomical photometry and (b) poor preparation of often terrestrially weathered meteorites. In the early 1970s, both laboratory measurements of properly prepared meteorite samples and astronomical observations of visible and near-IR asteroid spectra had advanced and were sufficient to address the fundamental questions concerning asteroid mineralogy and relationship to meteorites. Two basic approaches were employed: (a) attempts to assess asteroid mineralogy from first principles, based on absorption band centers for instance, and (b) spectral matching, in which it was simply assumed that if an asteroid spectrum resembled the spectrum of a particular class of meteorite it could be inferred that the two had similar mineralogy, even if the specific spectral features were not understood or were not unique.
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