|Out of Stargate universe information|
P5C-11 is a planet located in the Milky Way galaxy.
During their search of Colonel Jack O'Neill and Captain Samantha Carter, who were missing in action, Stargate Command put a mission to try to locate them, as it is a planet located between Earth and P4A-771, from where SG-1 ran of. According to Doctor Daniel Jackson and Sergent Siler, as Stargates are basicaly giant superconductors, it could discharge the matter stream on another Stargate between Earth and P4a-771.
Later, Daniel receives telemetry from P5C-11; it has no breathable atmosphere anymore, may be since a long and indefinite time.