The wavelength dependence of phase coefficients

Abstract The wavelength dependence (0.4 to 1.2 μm) of the phase coefficients of powdered samples of a basalt, the ordinary (L6) chondrite Bruderheim, and the carbonaceous chondrite Allende are shown to be qualitatively similar to the observed wavelength dependence of the phase coefficients of the Moon and S- and C-class asteroids, respectively. Model calculations of the surface roughness indicate that the systematic difference between the visual (λ = 0.55 μm) phase coefficients of S- and C-class asteroids reflects primarily differences in composition and not necessarily differences in surface roughness. On the average the large scale surface roughness of both S and C asteroids is comparable to that of the Moon. The wavelength dependence (0.4 to 0.7 μm) of three particle size fractions of sulfur (diameters

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