Helene (moon)
| |
| Discovery | |
|---|---|
| Discovered by | Laques and Lecacheux |
| Discovered in | 1980 |
| Orbital characteristics | |
| Semimajor axis | 377,400 km |
| Eccentricity | 0.0022 |
| Orbital period | 65h 41m 05s |
| Inclination | 0.02° |
| Satellite of | Saturn |
| Physical characteristics | |
| Mean diameter | 32 km (36 × 32 × 30) |
| Mass | ?kg |
| Mean density | ? g/cm3 |
| Surface gravity | ?m/s2 |
| Escape velocity | ?km/s |
| Rotation period | ? |
| Axial tilt | ?° |
| Albedo | ? |
| Surface temperature | ? K |
| Atmosphere | none |
Helene ("HELL uh nee" or "hel LEE nee") is a moon of Saturn. It was discovered by Pierre Laques and Jean Lecacheux in 1980 from ground-based observations at Pic du Midi Observatory, and was designated 1980 S 6. In 1988 it was officially named after Helene of Greek mythology.
It is co-orbital with Dione and located in its leading Lagrangian point (L4) and hence, before it received its permanent name of "Helene" it was usually referred to as "Dione B".
| Saturn |
|---|
| Janus' group | Mimas | Enceladus | Tethys | Dione | Rhea |
| Titan | Hyperion | Iapetus | Siarnaq's group | Phoebe's group |
| (For other moons, see: Saturn's natural satellites) |
| see also: Cassini-Huygens |
de:Helene (Mond) fr:Hélène (lune) nl:Helene (maan) zh:土卫十二