Diameter 138 km
85 mi.
Distance from primary 151,410 km
94,081 mi.
Nickname(s) Prometheus' Brother
The Shadow of Saturn's F Ring

Epimetheus is the fifth satellite of Saturn. It was discovered by R. Walker in 1980. It has an irregular shape with a size of 144x108x98 kilometers (89x67x61 miles) in diameter. It is traversed by several large and small grooves, valleys and ridges. Several craters larger than 30 km can be seen on its surface. The pervasive cratering indicates that its surface must be several billion years old.