Mathematics – Logic
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...59...25m&link_type=abstract
Icarus (ISSN 0019-1035), vol. 59, July 1984, p. 25-40.
Mathematics
Logic
69
Asteroids, Mineralogy, Petrology, Planetary Composition, Albedo, Astronomical Photometry, Data Acquisition, Data Reduction, Asteroids, Mineralogy, Petrology, Characteristics, Dynamics, Data, Structure, History, Catalog, Reflectance, Spectroscopy, Surface, Telescopic Observations, Composition, Absorption, Spectra, Oljato, Data Reduction, Parameters, Colors, Wavelengths, Infrared, Light (Visible Radiation), Comparisons, Earth Crossers
Scientific paper
The mineralogy and petrology of 17 near-earth asteroids are characterized using reflectance spectroscopy with ground-based telescopes. Assuming the surfaces are composed of cosmically abundant materials, the presence of certain mineralogical species can be determined from diagnostic absorption features and spectral characteristics which have been studied under known laboratory conditions and understood in terms of crystal-field theory. With one possible exception, the surface composition of near-earth asteroids consists of common rock-forming minerals such as olivine, pyroxene, and phyllosilicates. Opaque components are present but cannot be mineralogically identified with existing experimental data. The spectrum of 2201 Oljato cannot be interpreted in terms of common rock-forming minerals and is examined for cometary features because its high orbital eccentricity suggests a possible relation to comets, but no common cometary features are identified. The predominance of mafic silicate absorption features in spectra of near-earth asteroids (compared to the majority of main-belt asteroids) may be a primary compositional feature or may be the signature of relatively fresher asteroid material.
Gaffey Michael J.
McCord Th. B.
McFadden Lucy-Ann A.
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