Janus (moon)

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Janus in front of Saturn. Photo taken by Cassini-Huygens.

Janus is a moon of Saturn. It was discovered by Audouin Dollfus in 1966. Astronomers were first mistaken that another moon, Epimetheus, was the same is Janus. Voyager 1 confirmed in 1980 that there were two moons that share the same orbit.