The Beta Cassius system was an inhabited star system in Federation space. One of the passages into the system was by a stargate. By the mid-24th century, Haven, a planet of this system, had by treaty become a protectorate of the Federation.

In 2364, two ships visited the system: the USS Enterprise-D for shore leave, and a Tarellian starship attempting, successfully, to contact Wyatt Miller. (TNG: "Haven")

• Beta Cassius (primary)
  • Haven
    • Haven's moon