Discovered from Voyager images in 1982 by Synnott and provisionally called Tethys Co-orbital
It is designated Saturn XII
Physical Parameters
Diameter
35 x 32 x 30 kilometres (Helene is not spherical)
Orbital Parameters
Mean Distance from Saturn
377,400 kilometres
Mean Sidereal Period
2.737 earthdays
Eccentricity
0.005
Inclination
0.2 degrees
Opposition Magnitude (Average)
18.5
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