Astronomy and Astrophysics – Astronomy
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...38..267p&link_type=abstract
Icarus, vol. 38, May 1979, p. 267-287.
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Spectrophotometry, Uranus (Planet), Albedo, Astronomical Models, Graphs (Charts), Limbs, Methane, Uranus Atmosphere, Uranus, Photometry, Spectrum, Spatial Resolution, Limbs, Methane, Absorption Spectra, Wavelengths, Aerosols, Thickness, Atmosphere, Clouds, Observations, Darkening, Continuum, Hydrogen
Scientific paper
New narrow-band (100 A) photoelectric slit scan photometry of Uranus has been obtained in the spectral region 6000 to 8500 A. Coarse radial intensity profiles in seven wavebands are presented. Results of the investigation confirm earlier studies of limb brightening on the Uranus disk, but not all strong CH4 absorption bands are found to exhibit limb brightening. Specifically, the CH4 bands at 8000 and 8500 A show pronounced apparent limb darkening. Polar brightening may be responsible for the phenomenon. If so, an aerosol haze with a local optical thickness of approximately 0.5 or greater would be required. Visibility of the dense cloud layer located deep in the atmosphere might also cause apparent limb darkening. If so, the maximum permitted CH4/H2 mixing ratio in the visible atmosphere would correspond to 3 times the solar value.
Franz Otto G.
Price Michael J.
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