Ariannus is an inhabited planet located in the Arianna star system, at coordinates 2.23N 3.39E.

In the 23rd century, Ariannus was home to a center of culture and trade colony. In the late 23rd century, the world had a population of less than 10 million individuals, mostly humanoid, and the government was an associate member of the Federation. (FASA RPG module: The Federation; TOS episode: "Let That Be Your Last Battlefield")

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