Photometric study of Pluto near perihelion. Part 2: Refinement of rotation period: Color indices

Astronomy and Astrophysics – Astronomy

Scientific paper

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Brightness, Colorimetry, Perihelions, Planetary Rotation, Pluto (Planet), Spectrophotometry, Color, Electrophotometry, Reflectance, Ubv Spectra

Scientific paper

Study of brightness changes and color indices of Pluto are made. The observations were made in March-May 1982 and March-July 1983 using observations of 1953-1983 give a refined value of the photometric period of change in planetary brightness. Mean UBV brightness curves for 1980-1983 are constructed on the basis of 50 observations. A considerable reddening is discovered the the brightness maximum (phases 0.6-0.7). At the remaining phases the B-V and U-B color indices are constant. The asymmetry of the brightness curve for Pluto increased since the 1970's. The reddening at the brightness maximum may be attributable to the existence of a red spot in the equatorial region characterized by a reflectivity differing sharply from that for the remaining surface.

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