Physics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.conf...16k&link_type=abstract
Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites, p. 16
Physics
Petrology, Phobos, Regolith, Satellite Surfaces, Chondrites, Spectral Signatures, Phobos Spacecraft
Scientific paper
Observational understanding of the degree of differentiation on asteroid surfaces is clouded by questions of regolith evolution and hypothetical "space weathering." Recent debates about the existence of "space weathering," and whether it modifies S-type asteroids to took like chondrites, have not answered these questions; nonetheless, it is clear that some maturation of airless surfaces occurs that suppresses spectral signatures. A good opportunity to clarify regolith accumulation and maturation is offered by Phobos, because it is likely to be revisited in the next decade, and we can plan specific observations in advance. Phobos is not ideal in the context of understanding differentiated asteroids, because it is probably not differentiated and may have a "nonasteroidal" gardening regime by virtue of reabsorbing some of its own ejecta as well as debris from Mars; nonetheless, Phobos offers excellent opportunities to study aspects of the maturation process, with the advantage that we already know positions of relevant sites on its surface.
Hartmann William K.
Ksanfomality Leonid
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