Discovered by S. A. Collins, D. Carlson Date of Discovery 1980 Distance from Saturn 139,353 km Radius 74.0 × 50.0 × 34.0 km Mass ??? Orbital Eccentricity 0.003 Orbital Inclination 0.0° Orbital Period 0.6130 day Rotational Period ??? Density (gm/cm3) ???
This strange moon is shaped like an American football. Performing the shepherding function on the inner side of Saturn's F ring, along with Pandora on the outer side, Prometheus has a low density, which probably means it is composed largely of ice and may be quite porous.
Like Pandora, not much else is known about Prometheus. It was discovered through imagery from Voyager 1.
Sources: NASA.gov space.com