P5N-283 was a planet in the Milky Way galaxy which held a Stargate. It was visited by the Tau'ri in 2006 but many people lost their lives there. After the Atlantis expedition were forced to return to Earth, the loss of life on the planet became a point of contention among the members of Stargate Command and the newly integrated Atlantis members. Though the argument about the planet very nearly caused a brawl, Lt. Colonel Cameron Mitchell and Lt. Colonel John Sheppard were able to diffuse the situation. (SGA: "Course Corrections")