Epimetheus

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Epimetheus
Epimetheus is an inner satellite of Saturn. It is also known as Saturn XI. It is named after the mythological Epimetheus's orbit is co-orbital with that of Janus. Janus's mean orbital radius from Saturn is, as of 2006 (as shown by green color in the picture to the right), only 50 km less than that of Epimetheus, a distance smaller than either moon's mean radius. In accordance with Kepler's laws of planetary motion, the closer orbit is completed more quickly. Because of the small difference it is completed in only about 30 seconds less. Epimetheus (moon) - Wikipedia, the free encyclopedia
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Short Description Epimetheus is an inner satellite of Saturn. It is also known as Saturn XI. It is named after the mythological Epimetheus's orbit is co-orbital with that of Janus. Janus's mean orbital radius from Saturn is, as of 2006 (as shown by green color in the picture to the right), only 50 km less than that of Epimetheus, a distance smaller than either moon's mean radius. In accordance with Kepler's laws of planetary motion, the closer orbit is completed more quickly. Because of the small difference it is completed in only about 30 seconds less. Epimetheus (moon) - Wikipedia, the free encyclopedia
Discovered by Richard Walker
Discovery date December 18, 1966
Type Moon
AddInfo Saturn XI
Satellite of Saturn
Orbit Prograde
Rotation Synchronous
Apoapsis 06 152 894 km
Periapsis 06 149 926 km
Semi-major axis 06 151 410 km
Distance from Sun 01 9.554 909 au /07a
Eccentricity 0.009 8
Orbital period 0.694 333 517 day
Orbital speed 02 15.8 km/s
Inclination to the equator 000.351°
Diameter/Size 03 113.4 ± 6.2 km
Dimensions 129.8  × 114  ×  106.2 km
Mass 1017×5.266 kg
Density  0.640 g/cm3
Surface gravity  0.0064 – 0.011 m/s2
Escape velocity 02 35 m/s
Axial tilt
Albedo geometric 0.73
Temperature mean 02 78 K | -195 °C
Apparent magnitude 15.6
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