Epimetheus (moon)

Epimetheus
South pole of Epimetheus imaged by Cassini on 3 December 2007
Discovery
Discovered byRichard Walker
Discovery date18 December 1966
Designations
Designation
Saturn XI
Pronunciation/ɛpəˈmθəs/
Named after
Ἐπιμηθεύς Epimētheus
AdjectivesEpimethean /ɛpəˈmθən/
Orbital characteristics
151414 km (inner)
151489 km (outer)
Eccentricity0.0097
0.694329 d (inner)
0.694850 d (outer)
Inclination0.352°
Satellite ofSaturn
Physical characteristics
Dimensions129.6 × 116.2 × 107.0 km
(± 0.6 × 0.4 × 0.4 km)
117.2±0.6 km
Volume843290±2000 km3
Mass(5.25607±0.00081)×1017 kg
Mean density
0.6233±0.0015 g/cm3
0.0066–0.0109 m/s2
0.033 km/s at longest axis
to 0.036 km/s at poles
Synchronous
zero
Albedo0.73±0.03 (geometric)
Temperature≈ 78 K

Epimetheus /ɛpəˈmθəs/ is an inner satellite of Saturn. It is named after the mythological Epimetheus, brother of Prometheus.