Helene

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Helene
Helene 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. Helene is also designated Saturn XII, which it was given in 1982, and Dione B, because it is co-orbital with Dione and located in its leading Lagrangian point (L4). It is one of four known trojan moons. Helene (moon) - Wikipedia, the free encyclopedia
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Short Description Helene 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. Helene is also designated Saturn XII, which it was given in 1982, and Dione B, because it is co-orbital with Dione and located in its leading Lagrangian point (L4). It is one of four known trojan moons. Helene (moon) - Wikipedia, the free encyclopedia
Discovered by Laques and Lecacheux
Discovery date March 1, 1980
Type Moon
AddInfo Saturn XII / Dione B
Satellite of Saturn
Orbit Prograde
Rotation Synchronous
Apoapsis 06 380 100 km
Periapsis 06 374 740 km
Semi-major axis 06 377 396 km
Distance from Sun 01 9.554 909 au /18a
Eccentricity 0.002 2
Orbital period 2.736 915 days
Orbital speed 02 10.03 km/s
Inclination to the equator 000.199°
Diameter/Size 02 35.2 ± 0.4km
Dimensions 43.4 × 38.2 × 26 km
Mass 1017×8 kg
Density  0,5 g/cm3
Surface gravity  0,006 7 m/s2
Escape velocity  0 m/s
Axial tilt
Albedo geometric 1.67 ± 0.20
Apparent magnitude 18.4
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