Epimetheus is a small moon of Saturn that was discovered in 1980 by the Voyager 1 spacecraft. It is one of the innermost moons of Saturn and shares its orbit with another moon named Janus. These two moons are collectively known as the "Janus-Epimetheus co-orbital moons" because they share almost the same orbit and periodically swap their positions in a complex dance. Epimetheus has a diameter of about 116 kilometers and is irregularly shaped. It has a heavily cratered surface and a number of grooves and ridges, which are thought to be the result of tectonic activity on the moon's surface. One of the most interesting features of Epimetheus is the fact that it is believed to be a "shepherd" moon, which means that it helps to maintain the shape and structure of the rings of Saturn. Its gravity interacts with the particles in Saturn's rings, causing them to cluster and form distinct ringlets. Epimetheus has been studied extensively by the Cassini spacecraft, which captured detailed images of its surface and helped to deepen our understanding of this fascinating moon and the Saturnian system as a whole.
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