Delphi Ardu IV, classified as M-class, was the uninhabited fourth planet of the Delphi Ardu system. In the distant past, the planet was a part of the Tkon Empire.

Prior to stardate 41386, the Delphi Ardu system had only been charted by the Federation via long-range scans, that indicated no lifeforms, sentient or otherwise.

The planet was the ancient site of an outpost of the extinct Tkon, known as Outpost 63. (TNG: "The Last Outpost")

The planet model for Delphi Ardu IV later had its color changed to green and was used to represent Selay in "Lonely Among Us", Persephone V in "Too Short a Season", Antede III in "Manhunt", and Krios Prime in "The Perfect Mate".
According to Star Trek: Star Charts (p. 37; "United Federation of Planets II") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Delphi Ardu system was located in the Alpha Quadrant.

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