Mathematics – Logic
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3011l&link_type=abstract
American Astronomical Society, DPS meeting #39, #30.11; Bulletin of the American Astronomical Society, Vol. 39, p.470
Mathematics
Logic
Scientific paper
We obtained 96 disk-resolved images of the target of NASA's Dawn mission, asteroid (4) Vesta, from HST's WFPC2 PC camera. The observation was planned such that complete rotational coverage over the 5.34 hr rotational period was acquired through 4 filters centered at 0.439, 0.673, 0.953, and 1.042 microns. The sub-Earth latitude at Vesta of 18-19 deg S during the observation and Earth- Vesta distance of 1.17-1.18 AU, enable mapping of the southern hemisphere at a pixel scale of 38 km/pixel. These maps will complement the previous HST mapping in 1994 (Binzel et al. 1997) that mapped more northern latitudes. The rotational lightcurve shows a single peak, consistent with the albedo dominated origin. Color variations over the four observed wavelengths are suggested by the slightly different shapes of lightcuves. Preliminary disk-resolved photometric modeling and mapping have been performed using the shape model of Vesta (Thomas et al. 1997). The albedo variation is about 10% at all filters, consistent with the light curve amplitude. The distribution of albedo is slightly bi-modal, with two peaks at about +3% and -5% of the average. We report preliminary results of the photometric analysis and mapping as well as some mineralogical interpretations from the maps.
Li Jianyang
McFadden Lucy-Ann A.
Mutchler Max
Parker Joel William
Russell Christopher T.
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