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Neptune has brightened by more than 10% during the past several decades. Wereport on the analysis of published Johnson-Cousins B and V magnitudes datingback to 1954 along with new U, B, V, R, Rc, I and Ic photometry that werecorded during the past 24 years. Characteristic magnitudes, colors andalbedos in all seven band-passes are derived from the ensemble of data.Additionally, 25 spectra spanning 26 hours of observation on 5 nights areanalyzed. The spectrophotometry demonstrates that planetary flux and albedo isinversely related to the equivalent widths of methane bands. We attribute thechanges in band strength, flux and albedo to the high altitude clouds whichrotate across the planet's visible disk. Bright clouds increase albedo and fluxwhile reducing methane absorption. Synthetic V magnitudes derived from thespectroscopy also agree closely with the photometric quantities, whichcross-validates the two techniques. The spectroscopic and photometric resultsare discussed within the framework of the secular brightness variations ofNeptune.

The Secular and Rotational Brightness Variations of Neptune