| Uranus spectroscopy photometry and albedo by Christophe.P |
Uranus albedo, photometry and spectroscopy on November 9th, 2021. Taken with the Alpy600 (and the photometric slit), with complete spectrophometric method by Christian Buil. The planet is found to be brighter than the past years in the V band (albedo of 0,53) and more than the predicted value (Vmag=+5,65, JPL = +5,68). If true (and this is where the reduction is the most accurate), it must have something to do with the brightening of the polar region, which affects the V image. The spectroscopic albedo is almost equal to that of Erich Karkoschka (1995). The Alpy600 opens the way to get a partial U band, which although it lacks precision, is rather coherent with recent ALPO measurements (6,55/6,60). Rc and Ic are of the same order than my 2019 measurements with the Star Analyzer 100.
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