Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7443m&link_type=abstract
HST Proposal ID #7443
Physics
Hst Proposal Id #7443 Solar System
Scientific paper
The 1997 opposition of asteroid 4 Vesta offers an important opprtunity to map its diverse mineralogy with uniquely high contrast and to investigate more thoroughly the newly discovered major topographic feature at the south pole. The extremely high signal-to-noise { 300-400} imaging, broad wavelength coverage {0.95-2.22 microns} and distinctive narrow band filters provided by NICMOS allow the first discrimination of the mineralogies of lava flow regions between eucrite, howardite, and diogenite assemblages. The relative abundances and extents of these assemblages will reveal Vesta's volcanic and impact history. NICMOS can also discover regions where olivine may have been excavated to the surface by impacts penetrating into the mantle of Vesta. Such deep penetration events, although rare on the Moon, may be more common on smaller planetary worlds. Previous HST/WFPC2 visible maps of Vesta generated by members of our team exhibit one or more equatorial impact basins and an area of especially severe impact e xcavation near Vesta's south pole. The 1997 opposition offers the best opportunity to study this region until the year 2000. With the expected very high signal-to-noise images and photometric accuracy preserved by associated image processing, we expect to derive quantitative abundances of these four assemblages in each pixel to at least +/-10%.
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