The Alpha Onias system is an uninhabited but strategically significant star system near the Romulan Neutral Zone. In 2367, subspace anomalies were detected in this system, originating from the third planet. As there had been rumors about a secret Romulan base in the region for quite some time, the USS Enterprise-D proceeded to investigate it further. (TNG: "Future Imperfect")

• Alpha Onias (primary)
  • Alpha Onias I
  • Alpha Onias II
  • Alpha Onias III