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Helene
240px
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]
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, sometimes he-lee'-nee, /ˈhɛləni/, /həˈliːni/, Greek Ἑλένη) 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 Helen of Troy, who was the granddaughter of Cronus (Saturn) in Greek mythology. The moon is also designated Saturn XII.

It is co-orbital with Dione and located in its leading Lagrangian point (L4) and hence, before it received its permanent name it was usually referred to as Dione B.

File:Helene moon.jpg


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External links

... | Calypso | Helene | Dione | ...


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