Space Weathering on the Surfaces of Planets, Satellites and Asteroids

Details Space Weathering on the Surfaces of Planets, Satellites and Asteroids Space Weathering on the Surfaces of Planets, Satellites and Asteroids

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p52c..01h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P52C-01

Physics

5464 Remote Sensing, 6061 Remote Sensing, 6205 Asteroids And Meteoroids, 6235 Mercury, 6250 Moon (1221)

Scientific paper

The vapor deposition model of space weathering will be discussed. The changes in the optical properties of regoliths of silicate bodies without atmospheres, including spectral darkening, reddening and obscuration of absorption bands, are due to submicroscopic metallic iron. The iron particles are created during the deposition of vapor generated by both solar wind sputtering and meteorite impact vaporization. The history of the model will be briefly reviewed and evidence supporting it presented. It will be shown to be able to account quantitatively for changes in lunar optical properties, and to predict the alteration of spectra of ordinary chondrites to more closely resemble those of S-asteroids. Applied to Mercury, it implies that this body has a regolith in which FeO is low (~2-6%), but not completely absent.

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