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Janus is a small moon of Saturn that orbits very close to the planet. It's notable because it shares an orbital path with another Saturnian moon called Epimetheus, and the two moons periodically swap positions as they travel around Saturn.
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Janus /ˈdʒeɪnəs/ is an inner satellite of Saturn. It is named after the mythological Janus. This natural satellite was first identified by Audouin Dollfus on December 15, 1966, although it had been unknowingly photographed earlier by Jean Texereau. Further observations led to the realization that Janus shares a unique orbital relationship with another moon, Epimetheus. The discovery of these two moons' peculiar co-orbital configuration was later confirmed by Voyager 1 in 1980.
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