The Optical Maturation of a Chondrite Surface: Modeling for S-Type Asteroids and Meteorites

Details The Optical Maturation of a Chondrite Surface: Modeling for S-Type Asteroids and Meteorites The Optical Maturation of a Chondrite Surface: Modeling for S-Type Asteroids and Meteorites

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sosyr..38..203s&link_type=abstract

Solar System Research, v. 38, Issue 3, p. 203-211 (2004).

Computer Science

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Scientific paper

To compare the spectra of main-belt S-type asteroids and ordinary chondrites, we investigated the correlation between the reflectance peak position near 750 nm, the bend of the spectral curves in the 359-701 nm region, the linear gradient in the 359-853 nm range, and the absorption band position near 950 nm. In the diagrams of spectral parameters, the regions occupied by S-type asteroids and ordinary chondrites are separated. The modeling of the optical effect of maturation of ordinary-chondrite samples, which leads to variations in the meteorite spectral parameters, was carried out under the following conditions: (1) the increase of the concentration of reduced-iron grains (SMFe) in particles without any change in their size; (2) the increase/decrease of the size of particles at a constant concentration of SMFe in them; (3) we also examined different relations between the concentration and the size of SMFe in particles. But, under no conditions did we manage to bring into coincidence the asteroid and meteorite regions simultaneously in all spectral-parameter diagrams. Hence, the conclusion was made that the difference between the reflectance spectra of ordinary chondrites and those of large main-belt S-type asteroids is determined not only by space weathering of asteroidal surfaces but also by systematic differences in the material composition.

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