Helene is a small moon of Saturn that was discovered in 1980 by the Voyager 1 spacecraft. It is named after Helen of Troy in Greek mythology. Helene is a small, irregularly shaped moon with a diameter of about 32 kilometers. It orbits Saturn at a distance of about 377,400 kilometers, in the same orbit as the larger moon Dione, but is located about 60 degrees ahead of Dione in its orbit, in a stable region known as a Lagrangian point. Helene's surface is heavily cratered, with some areas covered in bright, icy material and other areas marked by long, linear features called "catenae" that are thought to be the result of impacts that caused chains of smaller craters. Helene is composed mainly of water ice, with small amounts of rock and other materials. It has a relatively low density, suggesting that it may have a partially liquid interior, with an ocean of liquid water sandwiched between layers of ice. Helene has been visited by the Cassini spacecraft, which made several flybys of the moon during its mission. Although these flybys did not provide detailed information about Helene's composition or interior, they did provide valuable insights into the dynamics of the Saturnian system and the formation of its rings and moons.
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