Theta Cygni XII was a planet in the Theta Cygni system, approximately 59.8 light years from the Sol system. At least one of the other planets in the system was a gas giant.

It was 20 light-years, in a rimward direction, from Ferenginar. (Star Trek Star Charts)

The planet was inhabited and was one of the worlds infested by the blastoneurons. (TOS: "Operation -- Annihilate!")

The Declaration-class starliner SS Accord was commissioned by the European Hegemony, sometime in the early 22nd century, for an expedition to Theta Cygni XII. (Star Trek: Accord: "The USS Accord Fictional History, v. 3.0")

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