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Solar System Exploration
Prometheus: Overview
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Black and white image showing Prometheus pulling material from one of Saturn's rings.
Saturn's moon Prometheus continues its dance with the planet's F ring, creating channels in the ring and streamers of extracted ring material as a result.

Prometheus acts as a shepherding satellite, constraining the extent of the inner edge of Saturn's F Ring. Prometheus is extremely irregular and has visible craters -- some up to 20 km (12.4 miles) in diameter. However, it is much less cratered than its nearby neighbors Pandora, Janus and Epimetheus. The density of Prometheus has been estimated to be low; it is probably a porous, icy body.

The potato-shaped moon is about 86 km (53 miles) across.

The Voyager 1 science team discovered Prometheus in October 1980.

How Prometheus Got its Name:
Moons of Saturn were originally named for Greco-Roman Titans and descendants of the Titans. But as many new moons were discovered scientists began selecting names from more mythologies, including Gallic, Inuit and Norse stories.

Prometheus [pro-MEE-thee-us] was the son of the Titan Iapetus and brother of Atlas and Epimetheus. He is best known in Greek mythology for stealing fire from the gods and giving it to humanity.

Prometheus was originally designated S/1980 S27.

Just the Facts
Orbit Size (semi-major axis):  139,380 km
Mean Radius:  43.1 km
Volume:  335,367 km3
Mass:  160,956,989,714,639,000 kg
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Last Updated: 12 Aug 2013