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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

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