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Science 7 February 1975:
Vol. 187. no. 4175, pp. 441 - 443
DOI: 10.1126/science.187.4175.441
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Articles

Callisto: Disk Temperature at 3.71-Centimeter Wavelength

Glenn L. Berge 1 and Duane O. Muhleman 1

1 Owens Valley Radio Observatory and Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91109

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 temnperatures that have been reported for wavelengths of 3.5 and 8.2 millimeters.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)