Phobos: Photometry and origin of dark markings on crater floors

Details Phobos: Photometry and origin of dark markings on crater floors Phobos: Photometry and origin of dark markings on crater floors

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7913976g&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Brightness, Craters, Darkness, Phobos, Surface Properties, Viking Orbiter 1, Deimos, Mars (Planet), Photointerpretation, Planetology, Reflectance, Surface Roughness Effects

Scientific paper

High resolution photographs of Phobos taken during close flybys of Viking Orbiter 1 reveal many dark patches on the floors of several craters. The apparently dark material is only prominent at large phase angles. Analysis of the photometric properties indicates that the dark patches represent areas of unusually rough textures whose reflectance near zero phase is similar to that of the mean surface (approximately 6 percent in the visible), but whose phase curve is much steeper. The contrast of such areas is less than 10 percent zero phase but approaches 100 percent near phase angles of 90 degrees. It is proposed that these intricately textured deposits represent patches of vesticular impact melt.

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