Long-Term Brightness Variations of Neptune and the Solar Cycle Modulation of Its Albedo

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Science  19 Dec 1986:
Vol. 234, Issue 4783, pp. 1543-1545
DOI: 10.1126/science.234.4783.1543


The visual brightness and albedo of Neptune vary periodically during the 11-year solar cycle with an amplitude of 4%, anticorrelated with the variation of solar ultraviolet output. A seasonal trend in color suggests that Neptune, like Uranus, may have a slightly reddened pole.