Prediction of types of pyroxenes on the surface of bright near-earth and near-Mars asteroids

Details Prediction of types of pyroxenes on the surface of bright near-earth and near-Mars asteroids Prediction of types of pyroxenes on the surface of bright near-earth and near-Mars asteroids

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992avest..26...77s&link_type=abstract

Astronomicheskii Vestnik (ISSN 0320-930X), vol. 26, no. 2, Mar.-Apr. 1992, p. 77-88. In Russian.

Astronomy and Astrophysics

Astronomy

Asteroid Belts, Earth Orbits, Mars (Planet), Planetary Composition, Pyroxenes, Solar System Evolution, Meteoritic Composition, Mineralogy, Stony Meteorites

Scientific paper

Colorimetric data of bright near-earth and near-Mars asteroids from TRIAD and ECAS are analyzed. Composition fields of pyroxenes were obtained for these asteroids from the value of the u-x color index and the ferrous absorption band position near 505 nm within the pyroxene quadrilateral. Pyroxenes of the S asteroids from the Apollo-Amur group which have spectral parameters similar to achondrites may be represented by the diopside-augite series. AA asteroids (S type), whose spectral parameters are similar to L-chondrites, have either a chondritic composition or Fe-rich orthopyroxenes and clinopyroxenes that are not encountered in meteoritic minerals. It is found that the average u-x color index increases with increasing average perihelion distance from 1 to 1.8 AU, which indicates the dependence of the chemical composition of pyroxenes on the surface of bright asteroids on this distance.

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