, Volume 5, Issue 1-2, pp 161-178

The sunlit lunar surface

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Certain studies were made of the lunar surface based on measurements at visible and far infrared wavelengths obtained from a scan over the full Moon. The large number of data points available made it possible to refine the albedo statistics over the disk previously described by Sytinskaya (1953). The simultaneous measurements at the two wavelengths provided a factor for converting full Moon photometric brightness to bolometric albedo. The disk-averaged value of this parameter is consistent with previous photometric measurements. The brightness temperature statistics over the disk led to a replacement of the traditional cos1/6 θ law of temperature variation over the full Moon by an expression which is linear in cosθ.

The untimely passing of John M. Saari (cf.The Moon 2, 405–407, 1971) has deprived the community of lunar scientists of one of its most vigorous and imaginative workers. Not unexpectedly, a number of projects were left unfinished at the time of his death, including a jointly-authored report of previously unpublished work pertaining to the photometric and infrared properties of the illuminated lunar surface. Despite the fact that the work is incomplete in certain respects, the manuscript contained a number of previously unreported items of general interest to workers in the field. For this reason, and in deference to Jack's memory, his colleagues have assembled the work into the two-part paper, entitled ‘The Sunlit Lunar Surface’, which appears in the pages which follow. The Editor expresses his gratitude to Drs. R. R. Green, J. F. Linsky, and D. F. Winter for reading and commenting upon these manuscripts.