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Published February 7, 1975 | public
Journal Article

Callisto: Disk Temperature at 3.71-Centimeter Wavelength


We observed the radio emission of Callisto with a three-element interferometer at the time of the 1973 opposition of Jupiter. Special care was taken to remove the residual, unresolved contribution from Jupiter itself in the antenna side lobes. The resulting disk temperature at a wavelength of 3.71 centimeters, assuming a radius of 2500±75 kilometers for Callisto, was 101°±25°K. This temperature is much more consistent with emission from a simple dielectric sphere than the considerably higher temperatures that have been reported for wavelengths of 3.5 and 8.2 millimeters.

Additional Information

© 1975 American Association for the Advancement of Science. Received 9 September 1974. We thank J, Lieske for the ephemeris calculations, B. Schupler for help with the observations, W. Russell for assistance with the data reduction, and I. Pauliny-Toth et al. for communicating their results to us in advance of publication. This research was carried out under NASA grant NGR-005-002-114, Office of Naval Research contract N00014-67-A-0094-0019, and National Science Foundation grant GP30400-X.

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