The photometric functions of PHOBOS and Deimos. II - Surface photometry of Deimos

Details The photometric functions of PHOBOS and Deimos. II - Surface photometry of Deimos The photometric functions of PHOBOS and Deimos. II - Surface photometry of Deimos

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..200n&link_type=abstract

Icarus, vol. 30, Jan. 1977, p. 200-211.

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Deimos, Mars (Planet), Phobos, Planetary Surfaces, Albedo, Astronomical Models, Light Scattering, Luminous Intensity, Mariner 9 Space Probe, Phase Shift, Satellite-Borne Instruments

Scientific paper

Mariner 9 television pictures of Deimos are used to study the uniformity of a certain photometric scattering parameter over the surface of the satellite. It is shown that the photometric data considered satisfy the reciprocity principle and that the Hapke-Irvine scattering law is adequate for describing the surface. Phase functions for Deimos are obtained from scans along the photometric equator, and the photometric behavior of the brightest and darkest areas on the satellite's disk is examined. The results indicate that the surface of Deimos is covered uniformly by a dark and texturally complex material whose photometric behavior is well-represented by the Hapke-Irvine law, that the intrinsic phase coefficient of this material is about 0.017 mag/deg over the phase-angle range from 20 to 80 deg, and that slightly brighter material is present near some craters. Since enhanced brightening was not observed at the specular point of the photometric equator in any of the pictures studied, it is concluded that large exposures of solid rock are absent from the Mars-facing side of Deimos.

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