Observations of giant planets at 1.4 MM and consequences on the effective temperatures

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Brightness Temperature, Gas Giant Planets, Millimeter Waves, Planetary Atmospheres, Planetary Radiation, Astronomical Models, Data Reduction, Neptune (Planet), Planetary Temperature

Scientific paper

Results of observations of giant planets at a mean wavelength of 1.4 mm are reported. More precise brightness temperatures of Jupiter, Saturn, and Uranus are given relative to Mars. A temperature measurement of Neptune at 1.4 mm has been obtained (153 plus or minus 30 K). Discussion and interpretation of these data is made with the aid of model atmospheres and by comparison with other infrared or radio measurements of giant planets. The effect of the H2/He ratio on far-infrared brightness temperature is discussed. Effective temperatures most compatible with observations and models are obtained for Saturn, Uranus, and Neptune.

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