Multicolor Photoelectric Photometry of the Brighter Planets. III. Observations from Boyden Observatory
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Abstract
Results of a program of photoelectric photometry of Mercury, Venus, Mars, Jupiter, and Saturn between 1963 and 1965 are presented. Observations were made in 10 narrow bands between 3150 A and 1.06 and in UB V. Phase curves and monochromatic albedos are determined. The results are compared with previous investigations. For Mercury, the portion of the visual phase curve observed is in good agreement with the results of Danjon; the spectral reflectivity is similar to that of the moon. The visual phase function of Venus shows less forward scattering than was found by previous investigators. The spectral reflectivity of Venus depends strongly on phase angle, the planet becoming much bluer at large phase angles. The radio- metric Bond albedo is estimated to be A* (9) = 0.77+0.07. No anomalous brightening at opposition was observed for the Martian opposition in 1965. Longitudinal variations for Mars are quite prominent for X> 6000 A. The present data yield a radiometric Bond albedo A* (6') = 0.24, which may be uncertain by +0.05. The observations of Jupiter and Saturn agree reasonably well with those obtained by Irvine et al.
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