Announcement |
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| Authors: | K Matthews G Neugebauer PD Nicholson |
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| Institution: | Palomar Observatory, California Institute of Technology, 320-47, Pasadena, California 91125, USA;Jet Propulsion Laboratory, 183–501, California Institute of Technology, Pasadena, California 91109, USA |
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| Abstract: | Maps of the ring system of Uranus, as seen in reflected sunlight at a wavelength of 2.2 μm, are presented for May 1978 and July 1979. Large azimuthal brightness variations revealed by these maps are consistent with the variable width established for the ? ring from occultation studies and support the existing elliptical model for this ring. An upper limit of ～0.010 is placed on the normal optical depth of any broad (～5000 km wide) axisymmetric ring component. There exists, however, an unexplained east-west asymmetry in the May 1978 map. In addition, multiaperture broadband infrared photometry of Uranus is reported, from which the geometric albedo of the planet at wavelengths of 1.25, 1.65, and 2.2 μm and the geometric albedo of the rings at 2.2 μm are derived. |
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