Starbase 51

Starbase 51 is a Federation space station located near Trill and the Murasaki system.

In 2376, eight Starfleet starships were operating out of the Starbase, including the USS T'Kumbra, the USS Sagittarius, the USS Polaris and the USS Appalachia. The latter was being refitted in August.

Admiral Leonard James Akaar contacted Starbase 51 in that month from Deep Space 9 to order the starships to engage and destroy the USS Gryphon. (DS9 novel: "Lesser Evil")