Alpha Cygnus II was the inhabited second planet of its star system. This was a non-Federation planet. Lieutenant J. Lowry Johnson, a crewmember aboard the USS Enterprise-D, was from this planet.
In 2369, this planet was listed on the chart USS Enterprise Personnel Database, which was displayed on a PADD used by Captain Jean-Luc Picard on aboard the Enterprise-D. (TNG: "The Chase", okudagram)
This planet was only mentioned in writing.