Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..372j&link_type=abstract
The Astronomical Journal, vol. 107, no. 1, p. 372-378
Other
15
Brightness Temperature, Nitrogen, Planetary Composition, Pluto (Planet), Thermal Emission, Astronomical Models, Astronomical Photometry, Submillimeter Waves, Pluto, Earth-Based Observations, Photometry, Emissions, Brightness, Thermal Properties, Temperature, Comparison, Surface, Nitrogen, Ice, Optical Properties, Satellites, Charon, Model, Frost, Emissivity, Flux, Wavelength
Scientific paper
Submillimeter photometry from the James Clerk Maxwell Telescope on Mauna Kea is used to study thermal emission from Pluto. The brightness temperatures at 800 and 1300 microns are TB = 42 +/- 5 K and TB = 35 +/- 9 K, respectively, essentially confirming a prior measurement of TB = 39 +/- 3 K at 1200 microns by Altenhoff et al. (1988). These are substantially smaller than brightness temperatures obtained previously at 60 and 100 microns (Aumann & Walker, (1987); Sykes et al., (1987)), showing that the surface of Pluto is nonisothermal, nongrey, or both. The data are incompatible with nitrogen-covered, isothermal T about 35 K Pluto models (Owen et al., (1993)). We suggest that the surface may be divided into cold regions coated by nitrogen ice plus warmer regions devoid of nitrogen, and we tentatively identify the latter with optically dark patches on Pluto's surface.
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