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Published August 15, 1963 | Published
Journal Article Open

Infrared photometric mapping of Venus through the 8- to 14-micron atmospheric window


The 200-inch Hale telescope has been used to obtain high-resolution maps, on four mornings juxtaposed about the Mariner 2 encounter, of the brightness temperature of Venus in the 8- to 14-micron wavelength interval. The resolution was about 1/30 of the disk of Venus. The signal-to-noise ratio was in excess of 100. The maps reveal (1) a general limb darkening, (2) a bilateral symmetry about the planet's orbital plane, (3) a very slight wedging of the contours as the only day-to-night effect, and (4) a transient temperature anomaly in the southern hemisphere.

Additional Information

Copyright 1963 by the American Geophysical Union. (Manuscript received May 23, 1963.) We have indeed been fortunate to be able to use the 200-inch telescope for these observations, and we wish to express our gratitude to the Mount Wilson and Palomar observatories. Financial support for this research has been made available through grant NsG 56-60 of the National Aeronautics and Space Administration and grant G-25210 of the National Science Foundation. Contribution 1172 of the Division of Geological Sciences of the California Institute of Technology, Pasadena, California.

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August 19, 2023
October 18, 2023