Online Astronomy eText: Satellites (Moons)
The Satellites (Moons) of Saturn: Helene Link for sharing this page on Facebook

1981 Voyager 2 photo of Helene
      Helene is located at the Lagrangian point 60 degrees ahead of Dione, which has trapped the smaller moon at that location through their mutual interaction with Saturn.

Data for Helene

Discovered by P. Laques and J. Lecacheus from ground-based photos taken in 1980
Named after one of the mythological Amazons, a daughter of Ares and Harmonia
Orbital size 377,400 km (about 235,000 miles) (identical to that of Dione)
Co-orbital with Dione, at Lagrangian point 60 degrees ahead of Dione
Orbital eccentricity 0%
Orbital inclination 0 degrees
Orbital period 2.73691 days (identical to that of Dione)
Diameter is (not quite round) 36 x 32 x 30 km (22 x 20 x 19 miles)
Mass, density and surface gravity unknown
Albedo (reflectivity) 70%
Orbit controlled by interaction with gravity of Saturn and Dione