In astronomy, Prometheus is a moon of Saturn, discovered in 1980 from images taken by the Voyager 1 spacecraft. It's a small, irregularly shaped moon, with a diameter of about 86 kilometers (53 miles).

Here are some key features of Prometheus:

* Shepherding Moon: Prometheus is known for its role as a shepherding moon, helping to maintain the shape and stability of Saturn's F ring. It interacts gravitationally with the ring particles, pulling some inwards and pushing others outwards.

* Unusual Shape: It has a distinctly elongated, irregular shape, likely due to its small size and relatively low density.

* Surface Features: The surface of Prometheus is heavily cratered, suggesting it's quite old.

* Active Geology: Interestingly, Prometheus also shows evidence of some geological activity, including possible landslides and even cryovolcanoes (volcanoes that erupt ice instead of molten rock).

Prometheus is a fascinating celestial object that provides valuable insights into the complex interactions between moons and planetary rings.