- One of the small, inner moons of Saturn.
It was discovered in 1980 from photos taken by Voyager
1 and is also known as Saturn XVI.
|Prometheus as imaged by Cassini
on Jan. 27, 2010 from a distance of 36,000 km
|Prometheus as imaged by Voyager 2 on August 25,
|A faint stream of material appears to connect
the F ring to Prometheus, the white blob at the bottom, in this
image taken by Cassini in July 2004
Prometheus and Pandora act as shepherd
moons for the inner edge of Saturn's F-ring. Prometheus is extremely
elongated and has a number of ridges and valleys on its northern side.
Although craters up to 20 km (12 miles) wide mark its icy surface, it
appears to be less heavily cratered than its neighboring moons Pandora,
Janus, and Epimetheus.
Its low estimated density suggests that it may be a porous, icy body.
See also Saturn, moons.
||1980, by S. Collins et al
||139,353 km (85,590 miles)
||119 × 87 × 61 km (74 × 54 ×
||0.019 km/s (68 km/h, 43 mph)
||0.613 days (14 hr 43 min.)
- A volcano on Io
known as the Jovian moon's "Old Faithful." Prometheus has been active
during every observation of it since it was first seen by Voyager 1,
though its plume, which is 80 km tall, has migrated about 85 km to the
- See also Project Prometheus.