Argus X
From Star Trek : Freedom's Wiki
Argus X was an uninhabited Class M planet located over 1000 light years from Tycho star system.
In 2268, the USS Enterprise conducted a planetary survey of the Argus X, discovering a large vein of tritanium ore. A survey vessel was arranged to be dispatched by Starfleet as result of the rich find.
Also discovered on the planet by the Enterprise landing party was the dangerous dikironium cloud creature, which attacked and killed (or nearly killed) five security guards. (TOS: "Obsession")
