Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974crasb.279..455b&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie B - Sciences Physiques, vol. 279, no. 17, Oct. 21, 1974, p. 455, 456. In Fr
Astronomy and Astrophysics
Astronomy
1
Polar Caps, Solar Longitude, Ultraviolet Photography, Venus (Planet), Astronomical Photography, Mariner Venus-Mercury 1973, Spaceborne Photography
Scientific paper
Ultraviolet images of Venus obtained from Mariner 10 and from earth-based telescopes in the period 1962-1974 were studied. The polar caps of Venus are not visible in the photographs taken in 1962-66. In the photographs from 1967-74, there is a relationship between the heliocentric longitude and the visibility of the polar caps. The polar caps are observed only from 345 to 165 degrees of heliocentric longitude. It remains to be determined whether this is a seasonal rhythm linked to the inclination of Venus' axis of rotation to its orbital plane.
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