Geologic Mapping of Vesta with the Hubble Space Telescope

Details Geologic Mapping of Vesta with the Hubble Space Telescope Geologic Mapping of Vesta with the Hubble Space Telescope

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.confr...2b&link_type=abstract

Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites, p. 2

Mathematics

Logic

3

Achondrites, Basalt, Olivine, Vesta Asteroid, Terrain Analysis, Pyroxenes, Hubble Space Telescope, Imaging Techniques, Spectroscopy

Scientific paper

The Wide Field Planetary Camera (WFPC2) and Hubble Space Telescope (HST) are outstanding tools for obtaining resolved images of the surface of Vesta at multiple wavelengths. We have used WFPC2 and HST to obtain rotationally resolved images of Vesta during its 1994 and 1996 apparitions. From multiple-filter imaging we have constructed geologic maps of Vesta's surface. We find Vesta to be geologically diverse and dichotomous at hemispheric scales. We find the eastern hemisphere to be dominated by units interpreted to be impact excavated plutonic material composed of Mg-rich and Ca-rich pyroxene. The mineralogy of this region appears to be most analogous to diogenite meteorites. Eastern hemisphere units that have the deepest and broadest I micrometer absorption bands may contain a substantial olivine component. The locations of these units are consistent with previous maps based on rotationally resolved groundbased spectroscopy. We find that the western hemisphere is dominated by units interpreted to consist of a single component of Mg-rich pyroxene, analogous to surface basalts such as eucrite meteorites.

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