Data for Janus
Discovered by Audouin Dollfus in 1966
Named after god of doorways, beginnings, and rising and setting of the Sun
Orbital size 151,472 km (about 94,000 miles) (co-orbital with Epimetheus)
Orbital eccentricity 1%
Orbital inclination 0.1 degrees
Orbital period 16.6 hours
Diameter 195 x 190 x 155 km (about 120 x 118 x 96 miles)
Mass, density and surface gravity very uncertain
Albedo (reflectivity) 80%
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