Photometry and Other Characteristics of Venus

Details Photometry and Other Characteristics of Venus Photometry and Other Characteristics of Venus

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jalpo..43d..17s&link_type=abstract

Journal of the Association of Lunar & Planetary Observers, The Strolling Astronomer (ISSN 0039-2502), Vol. 43, No. 4, p. 17 - 26

Astronomy and Astrophysics

Astronomy

Scientific paper

New photoelectric magnitude measurements are reported and these values have been combined with previously reported measurements in the selection of the photometric constants of Venus. The selected normalized magnitudes of Venus are: B(1,0) = -3.42, V(1,0) = -4.25, R(1,0) = -4.87 and I(1,0) = -5.14, while the selected solar phase angle coefficients for the B, V, R and I filters are: 0.0055, 0.0063, 0.0071 and 0.0062. Dichotomy measurements made between 1919 and 2001 have been reviewed and it is concluded that the Schroeter effect is real and that it is primarily due to two factors: 1) twilight scattering and 2) shading near the terminator. We also conclude that there is no correlation between the Schroeter effect and the 11-year solar cycle and that there is no difference in the magnitude of the Schroeter effect between eastern and western apparitions. There does, however, appear to be a ~35 year cycle in the magnitude of the Schroeter effect during most of the Twentieth Century. We also conclude that the cusp extensions of Venus may affect the observed phase of that planet and that irregularities near the terminator suggest large-scale vertical cloud relief of about 2-5 kilometers.

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