Study of the backscatter of light by solid surfaces of celestial bodies: the Brightness Opposition Effect.

Physics

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Planetary Surfaces: Albedo, Planetary Surfaces: Laboratory Simulations

Scientific paper

The contemporary state of studies of light backscatter effects by regolithlike surfaces in the optical range is analyzed. The observational and laboratory studies of the Brightness Opposition Effect (BOE) are considered. Their analysis shows that: a) BOE are characteristic of almost all solid surfaces of celestial bodies, including particles of cometary dust and zodiacal light; b) the BOE amplitude of bright bodies (asteroids of E-type and icy satellites of giant planets) is usually larger than for dark ones, but the peak is narrower; c) the BOE width increases for ground-down surface particles. According to laboratory data, for small phase angles one can observe a bell-shaped behavior of the phase dependence of brightness, implying the existence of a nonshaded BOE mechanism. This feature has not yet been observed for celestial bodies.

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