Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..806j&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 806-811.
Astronomy and Astrophysics
Astronomy
9
Brightness Temperature, Centimeter Waves, Radii, Radio Astronomy, Radio Interferometers, Titan, Very Large Array (Vla), Aerosols, Calibrating, Emissivity, Greenhouse Effect, Lunar Occultation, Methane, Satellite Atmospheres, Size Determination, Spectrometers, Temperature Inversions
Scientific paper
Brightness and radius measurements of the surface of Titan at 6, 2, and 1.3 cm wavelengths obtained with the Very Large Array radio interferometer are presented. Combined results for the three wavelengths indicate that the radius is 2400 + or - 250 km, implying a density of 2.4 + or - 0.7 g/cu cm, and that the brightness temperature is 87 + or - 9 K. The surface temperature may be somewhat higher if the emissivity is less than unity. The new data do not permit a choice between an inversion model for the atmosphere of Titan that predicts a surface temperature of 78 K and a model with both a stratospheric temperature inversion and a modest greenhouse effect that would increase the surface temperature by 10-40 K.
Caldwell J. Jr. J.
Jaffe Walter
Owen Theodore
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