The Tau Cygna system was a star system with at least five planets in the De lure belt. According to the provisions of the Treaty of Armens, the Sheliak Corporate could exercise a claim for this system.
In the mid-23rd century, the colony ship Artemis crash-landed on the fifth planet of this system. The survivors built a colony which lasted for nearly a century. However, under pressure from the Sheliak Corporate, the colonists were relocated to a new home. (TNG: "The Ensigns of Command")
- Tau Cygna (primary)
- Tau Cygna I
- Tau Cygna II
- Tau Cygna III
- Tau Cygna IV
- Tau Cygna V