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Helene: Facts & Figures
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Discovered By
P. Laques, J. Lecacheus
Date of Discovery
1 March 1980
Orbit Size Around Saturn (semi-major axis)
Metric: 377,420 km
English: 234,518 miles
Periapsis (closest)
Metric: 374,740 km
Apoapsis (farthest)
Metric: 380,100 km
Sidereal Orbit Period (Length of Year)
2.737 Earth days
Orbit Circumference
Metric: 2,371,369.91 km
Average Orbit Velocity
Metric: 36,100.5 km/h
Orbit Eccentricity
0.0071
Orbit Inclination
0.213 degree
Mean Radius
Metric: 17.6 km
By Comparison: 18 x 16 x 15 km, tri-axial
Equatorial Circumference
Metric: 110.6 km
Volume
Metric: 22,836 km3
Mass
Metric: 11,389,880,091,538,700 kg
Scientific Notation: 1.1390 x 1016 kg
Density
Metric: 0.5 g/cm3
Surface Area
Metric: 3,892.56 km2
Surface Gravity
Metric: 0.002 m/s2
Escape Velocity
Metric: 33 km/h
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Last Updated: 21 Mar 2011