Tellar Prime

A founding member world of the United Federation of Planets,  (or simply Tellar) is an M-class planet in the Tellar System and the homeworld of the Tellarites.

can currently not be visited in Star Trek Online, but the -assignment requiring the player to agree to accept a refugee in exchange for accepting a Tellarite junior Duty Officer for training can be found in sector space close to the Sol System.