Pacifica
Pacifica is a Class O planet located in the Taurus Reach. It was the site of some interest to the United Federation of Planets as the potential site for colonization in 2265. The planet was visited by the USS Bombay Prior to that vessels destruction at Ravanar IV by the Shedai Wanderer.
Pacifica is an ocean planet, whose warm blue waters and fine white beaches make it a jewel in the galaxy. The USS Enterprise-D was en route to a scientific mission to Pacifica in 2364, when Captain Jean-Luc Picard diverted it to Dytallix B for a secret meeting. The stop at Pacifica was canceled due to ensuing events. (TNG: "Conspiracy")
In 2365, a conference was held on Pacifica concerning the admission of the Antedeans into the Federation. The Enterprise was assigned to transport two Antedean dignitaries to the planet, as well as Ambassador Lwaxana Troi. (TNG: "Manhunt")
- The fact that the conference which should decide whether the Antedeans could join the Federation was held on Pacifica suggests that the planet itself is a member of it.
Mirror Universe
In the Mirror Universe Pacifica was a contested world. Neither the Klingon Empire nor the Terran Empire were able to establish a colony on that world as a result of constant attacks by the other party. For a short while the ISS Bombay was assigned to protect the Terran Colony there, but was drawn away in 2265 to the planet Ravanar IV where it was destroyed by the Shedai Wanderer.