title: Long-term brightness variations of neptune and the solar cycle modulation of its albedo.
abstract: 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.
authors.forename: G W
authors.initials: GW
authors.lastname: Lockwood
authors.forename: D T
authors.initials: DT
authors.lastname: Thompson