Implications for asteroidal regolith properties from comparisons with the lunar phase relation and theoretical considerations |
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| Authors: | Ewen A Whitaker |
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| Institution: | Lunar and Planetary Laboratory, University of Arizona, Tuczon, Arizona 85721, USA |
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| Abstract: | The phase relations of several asteroids. Mercury, and the Moon display the same basic characteristics, but differ slightly in detail. An improved treatment of the photometric function for open-work particulate layers shows that for phase angles greater than about 7°, the shape of the curves is diagnostic of the presence of such layers, and that both the shape and slope of the curves is dependent primarily upon the bulk density of these layers. This treatment also strongly indicates that the “opposition effect” is not due to shadow hiding in a regolith of very low bulk density. Other data support the idea that this effect is unrelated to shadow-hiding phenomena, and that it may thus be a diffraction/scattering effect with or without internal reflection phenomena also. |
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