Janus

Janus is an inner satellite of Saturn. It is also known as Saturn X. 
== History ==
=== Discovery ===
Janus was identified by Audouin Dollfus on 15 December 1966 and given the temporary designation S/1966 S 2. Previously, Jean Texereau had photographed Janus on 29 October 1966 without realising it. On 18 December, Richard Walker observed an object in the same orbit as Janus, but whose position could not be reconciled with the previous observations. Twelve years later, in October 1978, Stephen M. Larson and John W. Fountain realised that the 1966 observations were best explained by two distinct objects (Janus and Epimetheus) sharing very similar orbits, Walker is now credited with the discovery of Epimetheus. Voyager 1 confirmed this orbital configuration in 1980. (See co-orbital moon for a more detailed description of their unique arrangement.)
Category:Moons
Category:Saturnian Moons
Category:Shepherd Moon
Category:Inner Moon of Saturn
Category:Co-orbital Moon
Category:Objects with No Atmosphere
Category:Objects Not in Hydrostatic Equilibrium
Category:Outer Solar System Object
Category:Prograde Satellite
Category:Named Objects
Category:Named Moons
Category:Numbered Objects
Category:Numbered Moons
Category:Objects Visited by Spacecraft