Photometry of Venus. I - Observation of the brightness distribution over the disk

Details Photometry of Venus. I - Observation of the brightness distribution over the disk Photometry of Venus. I - Observation of the brightness distribution over the disk

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26...53d&link_type=abstract

Icarus, vol. 26, Sept. 1975, p. 53-72.

Astronomy and Astrophysics

Astronomy

6

Astronomical Photometry, Luminous Intensity, Venus Atmosphere, Aerosols, Astronomical Maps, Atmospheric Models, Isophotes, Photographic Recording, Tables (Data), Venus (Planet)

Scientific paper

Isophotes of the luminance distribution over the disk of Venus at several phase angles and in several wavelengths are constructed by means of isodensitometry of high-quality photographic negatives of Venus. Six isophote maps were made from a series of yellow light images (wavelength equals 5850 A), corresponding to phase angles from 22 to 129 deg. Special attention was paid to the rare occurrences of distinct features in yellow light. A sequence of isophote maps was taken in six wavelengths from 5850 to 3250 A. The ultraviolet cloud markings appear as changes in the isophote configurations for different wavelengths. Variations of contrast with wavelengths are deduced. Dark features, almost invisible at 4500 A, reach a contrast of 25 per cent at 3500 A which then no longer increases toward ultraviolet. A series of images taken in ultraviolet at 3500 A shows configurations characteristic of observations at short wavelengths for both the waxing and the waning crescent.

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