NASA / JPL / PDS Rings Node / montage by Emily Lakdawalla
Voyager 2's Umbriel image catalog
At 1,169 kilometers in diameter Umbriel is nearly identical in size to Ariel but looks surprisingly different. Its surface is much darker and lacks the flat-floored fractures that seam Ariel. A single bright-rimmed crater, named Wunda, appears near the terminator. Umbriel was on the opposite side of Uranus from Voyager 2 during the encounter, so the best images are still rather low resolution.