Epimetheus (moon)
Epimetheus /ɛpəˈmiːθiːəs/ is an inner satellite of Saturn. It is also known as Saturn XI. It is named after the mythological Epimetheus, brother of Prometheus.
South pole of Epimetheus imaged by Cassini on 3 December 2007 | |
| Discovery | |
|---|---|
| Discovered by | Richard Walker |
| Discovery date | 18 December 1966 |
| Designations | |
Designation | Saturn XI |
| Pronunciation | /ɛpəˈmiːθiːəs/ |
Named after | Ἐπιμηθεύς Epimētheus |
| Adjectives | Epimethean /ɛpəˈmiːθiːən/ |
| Orbital characteristics | |
| Epoch 31 December 2003 (JD 2453005.5) | |
| 151410±10 km | |
| Eccentricity | 0.0098 |
| 0.694333517 d | |
| Inclination | 0.351°±0.004° to Saturn's equator |
| Satellite of | Saturn |
| Group | Co-orbital with Janus |
| Physical characteristics | |
| Dimensions | 129.6 × 116.2 × 107.0 km (± 0.6 × 0.4 × 0.4 km): 2 |
Mean diameter | 117.2±0.6 km: 2 |
| Volume | 843290±2000 km3: 4 |
| Mass | (5.25607±0.00081)×1017 kg |
Mean density | 0.6233±0.0015 g/cm3: 4 |
| 0.0066–0.0109 m/s2: 3 | |
| 0.033 km/s at longest axis to 0.036 km/s at poles | |
| synchronous | |
| zero | |
| Albedo | 0.73±0.03 (geometric) |
| Temperature | ≈ 78 K |
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