Muin Iapetus
Iapetus (Greek: Ιαπετός), or occasionally Japetus, is the third-lairgest naitural satellite o Saturn, eleivent-lairgest in the Solar Seestem,
 Photomosaic of Cassini images taken on 31 December 2004. It shows the dark Cassini Regio and its border with the bright Roncevaux Terra, several large craters (Falsaron above center, Turgis, the largest, at right), and the equatorial ridge (the Toledo and Tortelosa Montes). | |
| Discovery | |
|---|---|
| Discovered bi | G. D. Cassini |
| Discovery date | October 25, 1671 |
| Designations | |
Alternative names | Saturn VIII |
| Adjectives | Iapetian, Japetian |
| Orbital chairactereestics | |
| 3560820 km | |
| Eccentricity | 0.0286125 |
Orbital period | 79.3215 d |
Average orbital speed | 3.26 km/s |
| Inclination |
|
| Satellite o | Saturn |
| Pheesical chairacteristics | |
| Dimensions | 1,492.0 × 1,492.0 × 1,424 km |
Mean radius | 734.5±2.8 km |
Surface area | 6700000 km2 |
| Mass | (1.805635±0.000375)×1021 kg |
Mean density | 1.088±0.013 g/cm³ |
Surface gravity | 0.224 m/s2 |
Escape velocity | 0.573 km/s |
| 79.3215 d (synchronous) | |
Axial tilt | zero |
| Albedo | 0.05–0.5 |
| Temperatur | 90–130 K |
Apparent magnitude | 10.2–11.9 |
References
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