Arcturus was a star located forty light-years from Earth. It was orbited by Arcturus II (PROSE: Transit) and Arcturus Six, (PROSE: Love and War) one of which may have been the Arcturian homeworld; they believed that the star's immense gravity was responsible for drawing away their world's atmosphere. (PROSE: Only a Matter of Time)

It was presumably part of the Arcturus sector. (PROSE: Lucifer Rising)

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