The Delphi Ardu system was an uninhabited planetary system with eleven planets. Outpost 63, a remote base of the extinct Tkon Empire, was located on Delphi Ardu IV. The Federation had by the mid-24th century charted this system with long-range probes. In 2364, USS Enterprise-D entered the system in pursuit of a D'Kora-class marauder which was alleged to have participated in the theft of a T-9 energy converter on Gamma Tauri IV. (TNG: "The Last Outpost" )