Agena (also known as Beta Centauri) is a multiple star system, located about 160 parsecs (530 light-years) from Earth, where it is visible as the second brightest system in the constellation of Centaurus. (TOS comic: "The Expansionist Syndrome")
- 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.
- Agena (Beta Centauri, primaries)
- Agena I
- Agena II
- Agena III
- Agena IV