Observations of Ganymede,Callisto, Ceres,Uranus, and Neptune at 3.33 mm wavelength |
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| Authors: | BL Ulich EK Conklin |
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| Institution: | National Radio Astronomy Observatory, Tucson, Arizona 85705, USA;National Astronomy and Ionosphere Center, Arecibo, Puerto Rico 00612 |
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| Abstract: | We have measured the 3.33 mm wavelength disk brightness temperatures of Ganymede (136 ± 21°K), Callisto (95 ± 17°K), Ceres (137 ± 25°K), Uranus (125 ± 9°K), and Neptune (126 ± 9°K). Our observations of Ganymede are consistent with the radiation from a blackbody in solar equilibrium, whereas Callisto's microwave spectrum indicates a surface similar to that of the Moon. The disk temperature for Ceres agrees with that expected from a rapidly rotating blackbody. The millimeter temperatures of Uranus and Neptune greatly exceed solar equilibrium values, implying atmospheres with large temperature gradients. |
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