Gamma 400 star system
The Gamma 400 star system was an inhabited planetary system in Sector 25712 of the Alpha Quadrant. A planet in this system was home to Starbase 12, the Federation command base for the sector. (; )

In 2256, this system was mentioned with Starbase 12's name on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the . ()

In 2257, during the first , this system was occupied by the Klingons. () 

In 2258, the system's location was labeled on a star chart seen on the main viewscreen of the . ()

In 2267, this system was the original destination of the  when it took the  in tow. After a failed spacejacking, Captain James T. Kirk decided to transport the crew of this ancient spacecraft to Ceti Alpha V which was lying on the Enterprise's route to Gamma 400. ()

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Star systems