PHOTOMETRIC INVESTIGATIONS OF THE LUNAR SURFACE,
REDSTONE SCIENTIFIC INFORMATION CENTER REDSTONE ARSENAL ALA TRANSLATION BRANCH
Pagination or Media Count:
The aim of this paper is the determination of the law according to which the light is reflected from the different parts of the lunar surface under various angles of incidence, reflection and phase. The photograms of the Moon obtained by Surovtseff in the focus of the normal astrograph of the Tashkent Astronomical Observatory were measured at the Astrophysical Institute of Moscow with the Harmann microphotometer. The photographic densities obtained with this instrument were transformed into brightness of the corresponding points by means of the scale of tubular photometer printed on each plate exactly with the same exposure. The extrafocal images of the Polar star photographed on the same plates with many different exposures were utilized for the determination of the same unit of brightness. The brightness of the different points of the Moon were corrected for effect of halation. It is found that our photometrical determinations for all phases from 0 degrees up to 140 degrees may be represented in a very satisfactory way by a mathematical equation which is a modification of the very well known Lommel-Seeligers formula.