Gamma Tauri IV was the uninhabited fourth planet in the Gamma Tauri system. This Federation system was located in the Alpha Quadrant. The Cardassian border was located near this system. (TNG: "The Last Outpost"; DS9: "Tears of the Prophets", okudagram).
Prior to 2364, the Federation established an unmanned monitor outpost on this planet. In 2364, the images of a Ferengi D'Kora-class raider were captured on the outpost's automatic scanners as a T-9 energy converter was heisted by crew members of the starship. Alerted by the theft, the starship Enterprise-D was tasked with pursuing the raider by Starfleet. During negotiations with the Ferengi, DaiMon Tarr of the Ferengi claimed this system was in Ferengi territory, a claim dismissed by Captain Jean-Luc Picard of the USS Enterprise-D. Later, with the persuasion of the Portal, the Ferengi returned the converter to the Federation. (TNG: "The Last Outpost")