Cygnia Minor was an inhabited planet and was the location for an Earth colony.

In 2266, this colony was facing the threat of famine. Doctor Thomas Leighton, a scientist living in a colony on the nearby Planet Q, sent a signal to the USS Enterprise, claiming to have discovered an extraordinary new synthetic food which would end the crisis on Cygnia Minor. It was soon discovered, however, that Leighton had lied about the discovery in order to lure the Enterprise to Planet Q to convince Captain Kirk that he had found Kodos the Executioner. (TOS: "The Conscience of the King")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts ("United Federation of Planets I", "United Federation of Planets II"), in 2378, Cygnia Minor was listed as a Federation member. This planet was located in the Albireo (Beta Cygni) star system in the Alpha Quadrant. The primary was a K-class star.
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