Astronomical Observatory of Kharkov National University Department of Solar, Lunar and Planetary Physics
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1999-2004 Astronomical Institute of Kharkov University. Department of Solar, Lunar and Planetary Physics

DSLPP > Moon > Light reflection law > Brightness distribution over disk

Influence of Albedo and Relief on the Lunar Photometric Function

Velikodsky Yu.I. The Influence of Albedo and Relief on the Law of Brightness Distribution over Lunar Disk // Thesis for a degree of candidate of physical and mathematical sciences (Ph.D.). -Kharkov, 2002. In Russian.

The dissertation is devoted to the experimental study of the law of light reflection by the Moon. The empirical formula of phase dependence of the smoothness factor of lunar surface in an interval of phase angles 0-135° is obtained, that permits to perform the comparative analysis of optical properties of the all lunar disk. Using a theory describing light scattering by porous surfaces, absence of essential influence of albedo on latitude dependence of brightness of a lunar surface is proved. It is shown, that at phase angles, at least, up to 142°, the smoothness factor q is determined only by a relief practically for all surface of the Moon. On the basis of the space data it is shown, that the smoothness factor of some flat mare areas, as against the rest of lunar surface, depends on albedo. It is related to low degree of a roughness of these areas.

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Yu.I.Velikodsky, L.A.Akimov, and V.V.Korokhin. The Latitude Dependance of Brightness of the Lunar Surface // Lunar and Planet. Sci. 33-rd. Abstract #1860. 2002. LPI. Houston.

It was obtained values of parameter of empirical Akimov's formula for different types of the lunar surface. Spectral dependance of this parameter was studied.

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Yu.I.Velikodsky, L.A.Akimov, and V.V.Korokhin. Two-parameter Empirical Photometric Function in Analysis of Earth-based Observations of the Moon // Lunar and Planet. Sci. 30-th. Abstract #1391. 2000. LPI. Houston.

Improved empirical Akimov's formula is presented. This photometric function gives a good fit to Earth-based and Clementine observational data. An influence of albedo and relief on the disk brightness distribution is discussed.

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Kreslavsky M.A., Shkuratov Yu.G., Velikodsky Yu.I., Kaydash V.G., Stankevich D.G., and Pieters C.M. Photometric properties of the lunar surface derived from Clementine observations // J. Geophys. Res. -2000. -V.105, No.E8. -P.20281-20295.

Akimov L.A., Velikodsky Yu.I., and Korokhin V.V. Dependence of Latitude Brightness Distribution Over The Lunar Disk On Albedo And Relief // Kinematika i fisika nebesnykh tel. -2000. -V.16, No 2. -P.181-187. In Russian.

Results of brightness distribution measurements of the lunar disk and laboratory samples at different phase angles in blue and red spectral bands are presented. It is shown for the Moon that brightness falling with photometric latitude is formed mainly by micro- and mesorelief of its surface. Small decreasing of brightness falling with wavelength is due to not so much albedo changing as changing of microrelief size range which has an influence on the law of light reflection by the Moon.

Akimov L.A., Velikodsky Yu.I., and Korokhin V.V. Dependence of Lunar Highlands Brightness on Photometric Latitude // Kinematika i fisika nebesnykh tel. -1999. -V.15, No 4. -P.304-309. In Russian.

Results of photometric measurements of the Moon at different phase angles are presented. Brightness distribution as the function of photometric latitude has been studied. It is shown that brightness falling to poles increases with phase angle a, and at a~120° the Moon reflects nearly by the Lambert's law. The origin of such phenomenon is discussed.

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