Abstract
As Voyager 2 approached Neptune for its 24 August 1989 encounter, we obtained numerous ground-based observations of the planet. These include photoelectric photometry at b (4720 Å), at y (5510 Å), and in the 6190-and 7250-Å methane bands, spectrum scans of the 6190-Å methane band at 32-Å resolution, and CCD images at 6190 and 8900 Å. We correlate photometric variations with the disk transit of bright features on the planet. The brightness and distribution of features changed noticeably during the apparition, causing changes in the photometric lightcurves. We discuss the implications for long-term variability.
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