helene (moon)

b>Helene
align="center" bgcolor="#000000" colspan=2 \|
bgcolor="#a0ffa0" colspan="2" \| Discovery
align="left" \| Discovered by	Laques and Lecacheux
align="left" \| Discovered in	1980
bgcolor="#a0ffa0" colspan="2" \| Orbital characteristics
align="left" \| Semimajor axis	377,400 km
align="left" \| Eccentricity	0.0022
align="left" \| Orbital period	65h 41m 05s
align="left" \| Inclination	0.02°
align="left" \| Satellite of	Saturn
bgcolor="#a0ffa0" colspan="2" \| Physical characteristics
align="left" \| Mean diameter	32 km (36 × 32 × 30)
align="left" \| Mass	?kg
align="left" \| Mean density	? g/cm³
align="left" \| Surface gravity	?m/s²
align="left" \| Escape velocity	?km/s
align="left" \| Rotation period	?
align="left" \| Axial tilt	?°
align="left" \| Albedo	?
align="left" \| Surface temperature	? K
align="left" \| Atmosphere	none

Helene (hel'-e-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 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

The Planetary Society: Helene

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

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