Janus (moon)
Moon of Saturn / From Wikipedia, the free encyclopedia
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"Saturn X" redirects here. For the spurious moon reported in 1905, see Themis (hypothetical moon).
Janus /ˈdʒeɪnəs/ is an inner satellite of Saturn. It is also known as Saturn X. It is named after the mythological Janus.
Quick Facts Discovery, Discovered by ...
Discovery | |
---|---|
Discovered by | Audouin Dollfus |
Discovery date | 15 December 1966 |
Designations | |
Designation | Saturn X |
Pronunciation | /ˈdʒeɪnəs/[1] |
Named after | Jānus |
Adjectives | Janian /ˈdʒeɪniən/[2][3] |
Orbital characteristics [4] | |
Epoch 31 December 2003 (JD 2 453 005.5) | |
151460±10 km | |
Eccentricity | 0.0068 |
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)[5]: 2 |
Mean diameter | 178.0±1.0 km[5]: 2 |
Volume | 2953010±950 km3[6]: 4 |
Mass | (1.89388±0.00028)×1018 kg[lower-alpha 1] |
Mean density | 0.6413±0.0002 g/cm3[6]: 4 |
0.0111–0.0169 m/s2[5]: 3 | |
0.05 km/s at longest axis to 0.058 km/s at poles | |
synchronous | |
zero | |
Albedo | 0.71±0.02 (geometric) [7] |
Temperature | 76 K |
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