Analysis of the Asteroid Phase Dependences of Brightness

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Scientific paper

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Asteroids, Opposition Effect, Phase Curve

Scientific paper

Since we cannot obtain distribution of brightness over the asteroid disk, an integral phase dependence of brightness contains a fundamental information about the optical properties of surface, its structure and a probable formation mechanism of the optical appearances on the surface. There are some empirical and theoretical functions with few parameters which characterize physical properties of the surface regolith. At present Hapke, Lumme-Bowell and HG functions are applicated for describing the magnitude-phase relations for the asteroids and other atmosphereless bodies. However, Hapke and Lumme-Bowell functions have a lot of observation data, i.e. it is always possible to find a new set of the parameter values when the approximation function is contented with the observation data. Hg-function is ill-fitted to the magnitude-phase relations in the spike-effect region (alpha <= 2 degrees).

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