Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpspr...7...45l&link_type=abstract
In its USSR Rept.: Space (JPRS-USP-85-003) p 45 (SEE N85-25284 15-12) Transl. into ENGLISH from Pisma v Astron. Zh. (USSR), v
Astronomy and Astrophysics
Astronomy
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.
Lyutyy V. M.
Tarashchuk V. P.
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