Helene (moon)

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Helene
image:Helene moon.jpg
Discovery
Discovered by Laques and
Lecacheux
Discovered in March 1, 1980
Orbital characteristics
Semimajor axis 377,396 km
Eccentricity 0.0022
Orbital period 2.736915 d [1] (http://exp.arc.nasa.gov/downloads/celestia/data/solarsys.ssc)
Inclination 0.199 (to Saturn's equator)
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 assumed synchronous
Axial tilt zero
Albedo  ?
Surface temperature  ? K
Atmosphere none

Helene (hel'-e-nee, Greek Ελένη) 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 S/1980 S 6. In 1988 it was officially named after Helene of Greek mythology. It is also designated as Saturn XII.

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".

External links


... | Telesto, Tethys, Calypso | Polydeuces, Dione, Helene | Rhea | ...


Saturn's natural satellites
Janus' group | Mimas | Enceladus | Tethys | Dione | Rhea | Titan | Hyperion | Iapetus | Inuit group | Gallic group | Norse group
de:Helene (Mond)

fr:Hlne (lune) nl:Helene (maan) nn:Saturnmnen Helene zh:土卫十二

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