A two-color map of Pluto's sub-Charon hemisphere

Pluto and its satellite Charon regularly occulted or transited each other's disks from 1985 through 1990. The light curves resulting from these events (collectively called "mutual events") have been used to determine albedo m aps of Pluto's sub-Charon hemisphere. We now use a data set of four light c urves that were obtained in both B and V Johnson filters to construct a two -color map of Pluto's surface. We are able to resolve the central part of P luto's sub-Charon hemisphere. We find that the dark albedo feature that for ms a band below Pluto's equator is comprised of several distinct color unit s. We detect ratios of V-filter/B-filter normal reflectances ranging from s imilar to1.15 to similar to1.39 on Pluto's sub-Charon hemisphere.