Known Space -- Sol -- Saturn -- | Helene |
Helene, Saturn's thirteenth moon, is called a Dione Trojan satellite because it shares the same orbit as Dione at about 60 degrees ahead of its larger companion (Dione's leading Lagrange point).
Orbital Distance: 377,400 km (average) Eccentricity: 0.005 Local Year: 2.737 days (2d 17h 41m 9s) Orbital Velocity: 10.028 km/s Inclination: 0.20° Local Day: 2.737 days (2d 17h 41m 9s) Axial Tilt: n/a Diameter: 36 km x 32 km x 30 km Composition: Ice and gas pockets Density: 0.91 g/cm3 Mass: 1.56 x 1013 tonnes (3/billion earths) Gravity: 0.0004 G Escape Velocity: 0.011 km/s Area: 3,000 km2 Surface Material: Mostly H2O ice Atmosphere: None Pressure: None Albedo: 0.70 Temperature: ???°C |