Optical studies of moon rock samples at various degrees of maturity

Details Optical studies of moon rock samples at various degrees of maturity Optical studies of moon rock samples at various degrees of maturity

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpspr...4...83a&link_type=abstract

In its USSR Rept.: Space (JPRS-USP-84-003) p 83-84 (SEE N84-28823 19-12) Transl. into ENGLISH from Astron. Vestn. (USSR), v.

Astronomy and Astrophysics

Astronomy

Aging (Materials), Brightness, Color, Moon, Polarization, Regolith, Light Scattering, Lunar Surface, Lunik Lunar Probes, Phase Shift, Physical Properties, Rocks, Scattering Functions

Scientific paper

The effect of degree of maturity in lunar regolith on the optical effects of phase dependence of polarization and brightness and color at low phase angles was studied. Two pairs of samples obtained at the Lunar 16 and Lunar 24 landing sites were used in the study. Samples were similar in composition but differed in terms of maturity; details of physical properties are listed. Measurement of phase dependence for brightness and polarization was done in three intervals of the visible range (lambda 0.45, 0.50 and 0.65 micrometers). Scattered light was recorded using a low-angle receiver at various angles of incidence. Scattering angle was measured at 45 deg. Minimum phase angle was approximately 3 deg. Measurement of the scattering function was done at intervals of 3/4 deg. Results are shown in tabular and graphic form. The findings show that the opposition effect is greater in more mature samples, particularly in red light. Phase dependence for sample color was also found to depend directly on the maturity of samples, with the color index increasing in step with increasing phase angle. Negative polarization increased slightly in nature samples. Results were compared with earlier studies and theoretical models were examined.

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