Optical effects of regolith processes on S asteroids as simulated by laser impulse alteration of ordinary chondrite

Details Optical effects of regolith processes on S asteroids as simulated by laser impulse alteration of ordinary chondrite Optical effects of regolith processes on S asteroids as simulated by laser impulse alteration of ordinary chondrite

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1011m&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 1011-1012 (SEE N94-16173 03-91

Physics

1

Asteroids, Brightness Distribution, Chondrites, Impulses, Laser Outputs, Mineralogy, Optical Properties, Spectral Reflectance, Spectrum Analysis, Meteoritic Damage, Meteoroid Showers, Micrometeorites, Olivine, Powder (Particles), Pyroxenes, Regolith

Scientific paper

The spectral properties of some powdered chondrites and minerals altered by Isser impulse are studied in order to estimate possible optical effects of regolith processes (micrometeoritic bombardment). Gradual reduction of overall reflectance and spectral contrast, the increase of continuum slope, the increase of spectrally derived olivine/pyroxene ratio and Fs content of orthopyroxene with increasing alteration degree show that regolith processes could affect optical properties of surface material more heavily than has been previously appreciated. Ordinary chondrites (OC's) are known to account for 80 percent of observed meteorite falls, but so far no main belt parent bodies have been identified for these meteorites. S-asteroids resemble OC's spectrally, but are characterized by a steeper red continuum unlike that of OC's and their spectrally derived mineralogies are far outside OC range. Attempts were made to explain the spectral mismatch between OC's and S asteroids by some process, which alters optical properties of uppermost regolith. However, the spectral studies of shocked (black) OC's, gas-rich OC's, melted OC's and synthetic metal-rich regoliths derived from OC's demonstrate that such altered OC materials darken, but do not redden.

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