This Voyager 2 picture of Oberon is the best the spacecraft acquired of Uranus' outermost moon.
Acquired on Jan 24, 1986, at a distance of 660 000 Km from Oberon.
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NASA Photo Journal
2018 January 31
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Oberon is the outermost of Uranus' moons and is the second largest. Oberon dark-red surface is more heavily cratered than that of any other major moon of Uranus.