Evidence from Voyager II photometry for early resurfacing of Umbriel

@article{Helfenstein1989EvidenceFV,
  title={Evidence from Voyager II photometry for early resurfacing of Umbriel},
  author={P. Helfenstein and Peter C. Thomas and Joseph Frank Veverka},
  journal={Nature},
  year={1989},
  volume={338},
  pages={324-326}
}
THE uranian satellite UmbriePs dark, heavily cratered surface is remarkable for its apparent uniformity in Voyager II images1. Its most conspicuous geological feature is a comparatively high-albedo, annulus-shaped deposit which covers the floor of the 40-km diameter crater Wunda1. Here we present new Voyager II albedo maps of Umbriel which reveal that its surface is subdivided into low-contrast, crudely polygonal areas ranging in size from tens to hundreds of kilometres (Fig. 1). The largest… 

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