Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7177s&link_type=abstract
HST Proposal ID #7177
Other
Hst Proposal Id #7177 Solar System
Scientific paper
Because of their proximity to the planet, the near-infrared spectral reflectance of the two Mars satellites, Phobos and Deimos, is very poorly known. Both have albedos of about 0.07, thereby resembling carbonaceous chondrite meteorites, C-type asteroids or the dark satellites of the outer solar system more than the planet about which they orbit. These observations are part of a larger program of characterizing and intercomparing the spectral reflectance properties of other dark solar system objects, including the rings of Uranus, the larger of the inner satellites of Uranus and Neptune, and Kuiper Belt Objects {KBOs}. To minimize interference by scattered light from Mars, these observations should be made when Mars is near its closest approach in late April, 1999. The timing of the observations should place Mars just outside the NIC3 field, with Phobos near its maximum elongation and Deimos within the same NIC3 field and close to its same elongation. For example, one good opportunity occurs at 0600 UT on April 24th, near the time of western elongation of Phobos and within two hours of western elongation of Deimos.
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