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34 4 c1 I 1 0 0 4I-l x x hl . 1 N o r m a l Albedo Normal albedo values for the front and rear faces of the Moon are listed in table VIII. Table IX gives normal albedo values for some prominent features on the front face. 2 Photometric Model The luminance, B, of the lunar surface is related to the photometric function, @, the solar constant, E (1400 watts/m2 at 1 AU), and the normal albedo, p, , by the equation E B =-a Po 4J where the function, 4, depends on the phase angle, g, and surface orientation angle, a,as shown in figure 15.

45 41. : Photometric Properties of Lunar Crater Floors. Res. Astr. , Utrecht, Netherlands, vol. 14, no. 2, 1959. Translated, NASA-TT-F-209, Aug. 1964. 42. Shorthill, R. ; Saari, J . ; Baird, F. ; and LeCompte, J. : Photometric Properties of Selected Lunar Features. Report prepared by The Boeing Company for the NASA Manned Spacecraft Center under Contract NAS 9-7665, Sept. 1968. 43. ; Coffeen, T. : Wavelength Dependence of Polarization. 111. The Lunar Surface. The Astron. , vol. 69, no. 10, Dec.

Actual horizonal force includes both a friction and plowing action thrcjugh the soil. Tabulated range is representative of the effective ratio estimated from Surveyor lunar landings and from the motion of the alpha scattering instrument package during the Surveyor 3 vernier engine firing experiment. Geometric albedo - The brightness of the surface divided by the brightness of a Lambert surface having the same inclination as the surface. ) Isophote - A line of equal or constant brightness. Loss tangent - The capacity of a material to transmit a wave.

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