Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...233...70h&link_type=abstract
Science (ISSN 0036-8075), vol. 233, July 4, 1986, p. 70-74.
Astronomy and Astrophysics
Astronomy
72
Ariel, Infrared Spectroscopy, Miranda, Spaceborne Astronomy, Uranus (Planet), Voyager 2 Spacecraft, Brightness Temperature, Helium, Temperature Profiles, Thermal Emission
Scientific paper
Initial results are presented from analyses of IR interferometer spectrometer data collected by Voyager 2 during passes of Uranus and the moons Miranda and Ariel. The data covered reflected solar radiation in the visible and near-IR and thermal emissions between 25 and 50 microns. An equatorial atmospheric He mole fraction of 0.10-0.20 and a mass fraction of 0.16-0.34 was observed for Uranus. Para-hydrogen was also a significant fraction Uranus CH4 atmosphere. Average polar and equatorial spectra were employed to generate vertical temperature profiles between 60-900 mbar, with the finding that the temperatures at the equator and the poles are markedly similar between 400-900 mbar. The effective temperature of Uranus had a calculated upper limit of about 59.4 K, while the subsolar temperatures of Miranda and Arial were around 86 and 84 K, respectively. The albedos of the two satellites indicated surface microstructures composed of isotopically scattering grains.
Conrath Barney
Flasar Michael F.
Hanel Rudolf
Horn Lauren
Kunde Virgil
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