Zeta Centauri is a binary star system, located about 118 parsecs (385 light years) from Earth, where it is visible as in the constellation of Centaurus. The USS Enterprise was bound to scout Zeta Centauri for class M planets in 2266. (TOS comic: "Child's Play") Since this is a "real" star system, we know details about its location and makeup not revealed in its Star Trek mentions, where it was only mentioned by name.