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Epimetheus, one of the moons of Saturn, was discovered, but was mistaken for Janus; it took twelve years to determine that they are two distinct objects sharing the same orbit.
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Epimetheus (moon)
Moon of Saturn
Epimetheus is an inner satellite of Saturn. It is also known as Saturn XI. It is named after the mythological Epimetheus, brother of Prometheus.Source: Wikipedia (CC BY-SA)
Moons of Saturn
Natural satellites of the planet Saturn
The moons of Saturn are numerous and diverse, ranging from tiny moonlets only tens of meters across to Titan, which is larger than the planet Mercury. As of 11 March 2025, there are 274 moons with confirmed orbits, the most of any planet in the Solar System. Three of these are…Source: Wikipedia (CC BY-SA)
Janus (moon)
Moon of Saturn
Janus is an inner satellite of Saturn. It is also known as Saturn X. 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…Source: Wikipedia (CC BY-SA)
Orbit
Curved path of an object around a point
In celestial mechanics, an orbit is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange…Source: Wikipedia (CC BY-SA)