Starbase 55

Starbase 55 was a Federation starbase administered by Starfleet in the late 24th century.

In 2364, prior to stardate 41044.2, the starship USS James Fennimore Cooper had a stay at this starbase before its rendezvous with the USS Discovery. 

Five years later, in 2369, It was the destination of the USS Enterprise (NCC-1701-D) following the discovery of a Dyson sphere.