Oberon (moon)
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Oberon is the outermost and second-largest major moon of the planet Uranus. It is the second-most massive of the Uranian moons, and the tenth-largest moon in the Solar System. Discovered by William He
Oberon, as imaged by Voyager 2, January 1986. A number of bright-rayed craters are visible, with the largest, Hamlet, at center. At the lower left limb rises an 11 km high mountain.
Jupiter family
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Umbriel
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Umbriel is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell at the same time as neighboring moon Ariel. It was named after a character in Alexander Pope's 17
Oberon (moon)
…Uranus then known were suggested by Herschel's son John in 1852, at the request of William Lassell, who had discovered the other two moons, Ariel and Umbriel, the year before. It is uncertain if Herschel devised the names, or if Lassell did so and then sought Herschel's permission. The adjectival form of the…
Grayscale image of Umbriel from Voyager 2, January 1986. Umbriel's surface is heavily battered; the bright crater Wunda can be seen at the top of the image near the moon's equator
False color image of Umbriel showing polygons
The Voyager 2 spacecraft