The Janus system is a star system. This system, located in the Alpha Quadrant, had at least six planets, and the sixth planet of this system was inhabited by an indigenous species named the Horta. Prior to 2267, the Federation had established a mining colony on this planet.

In 2267, the USS Enterprise visited the system. (TOS: "The Devil in the Dark")

• Janus (primary)
  • Janus I
  • Janus II
  • Janus III
  • Janus IV
  • Janus V
  • Janus VI