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Janus
Janus Moon

Janus: A-ring Shepherd Moon of Saturn

Janus is one of the moons of planet Saturn. Janus, along with Epimetheus, are shepherd moons for the A ring of Saturn. Both Janus and Epimetheus are co-orbits, meaning they share essentially the same orbit around Saturn, and "swap" places every 4 years.

For a listing of all moons, see Moons of the Planets.

Janus Facts
      1. Mass (kg)
      2. 2.01e+18
      1. Radii (km)
      2. 98x96x75
      1. Density (gm/cm3)
      2. 0.67
      1. Distance from planet (km)
      2. 151,472
      1. Rotational period (days)
      2. 0.6945
      1. Orbital period (days)
      2. 0.6945
      1. Orbital velocity (km/sec)
      2. 15.87
      1. Eccentricity of orbit
      2. 0.007
      1. Inclination of orbit (°)
      2. 0.14
      1. Albedo
      2. 0.8
      1. Magnitude (Vo)
      2. 14.5
      1. Atmosphere