In 2293, the location of Omega Cygni in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, okudagram)
This planet was only mentioned in dialogue.
According to the final draft of the script for TAS: "The Time Trap", and later adapted in Alan Dean Foster novelization Star Trek Log 4 and Star Trek: SCE, Magen was from a planet located in the Omega Cygni system. This was also stated in the Star Trek Concordance [page number? • edit], which liberally lumped the system and planet together into the same entry.
In the novelization of "Mudd's Passion" in Star Trek Log 3, the name "Omega VII" was used of this planet.