Values of the Photometric Parameters of Mars and Their Interpretation
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
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Photometric data for the Martian disk obtained by Thorpe from television-camera pictures taken by Mariner 9 have been used to derive values for the parameters in the photometric function due to Meador and Weaver. The photometric function can thus be applied to Mars and to the design of cameras for photography of Mars. Values of the parameters are for one wavelength only, 0.56 micrometers, and are average or effective values for the Martian disk. The values derived herein have been interpreted to provide semi-quantitative information on the soil. The results do not disagree with other indications that the effective mean diameter of the surface particles is about 400 micrometers. Another result is that the mean intercenter spacing of adjacent particles may be about 43 of the mean diameters.