Ariannus was a Federation M-class planet and a vital transfer point for commercial traffic lanes. In the 23rd century, it had a population of one billion. (TOS: "Let That Be Your Last Battlefield") The location of Ariannus was depicted on a Federation star chart. It was located near Beta Niobe. (TNG: "Conspiracy")
A Federation star chart depicting the location of Ariannus
In 2268, Ariannus was infected by a bacterial invasion that threatened to destroy all life on the planet. The crew of the USS Enterprise conducted an orbital decontamination mission to save the planet's inhabitants. (TOS: "Let That Be Your Last Battlefield")
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