Janus (moon)
Janus /ˈdʒeɪnəs/ is an inner satellite of Saturn. It is also known as Saturn X. It is named after the mythological Janus.
Janus as imaged by Cassini on 7 April 2010: highest-resolution full-disk image to date | |
| Discovery | |
|---|---|
| Discovered by | Audouin Dollfus |
| Discovery date | 15 December 1966 |
| Designations | |
Designation | Saturn X |
| Pronunciation | /ˈdʒeɪnəs/ |
Named after | Jānus |
| Adjectives | Janian /ˈdʒeɪniən/ |
| Orbital characteristics | |
| Epoch 31 December 2003 (JD 2 453 005.5) | |
Semi-major axis | 151460±10 km |
| Eccentricity | 0.0068 |
Orbital period (sidereal) | 0.694660342 d |
| Inclination | 0.163°±0.004° to Saturn's equator |
| Satellite of | Saturn |
| Group | Co-orbital with Epimetheus |
| Physical characteristics | |
| Dimensions | 203.4 × 185.8 × 149.0 km (± 1.8 × 0.6 × 0.6 km): 2 |
Mean diameter | 178.0±1.0 km: 2 |
| Volume | 2953010±950 km3: 4 |
| Mass | (1.89388±0.00028)×1018 kg |
Mean density | 0.6413±0.0002 g/cm3: 4 |
Surface gravity | 0.0111–0.0169 m/s2: 3 |
| 0.05 km/s at longest axis to 0.058 km/s at poles | |
Synodic rotation period | synchronous |
| zero | |
| Albedo | 0.71±0.02 (geometric) |
| Temperature | 76 K |
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