Verdanis was a planet that was located ten days away from Terra 10, and the star Cepheus. It was described by James T. Kirk as "very beautiful, much like Earth,"
In 2269, the USS Enterprise transplanted the Terratin colony from the dying Terra 10 to a fertile and well watered plain on Verdanis. (TAS: "The Terratin Incident")
Verdanis was located in the Verdanis (Terratin (Beta Cephei)) system, in the Alpha Quadrant. The system's primary was a Class G star. It had a magnitude of +1, which was a hundred times brighter than Sol. By 2378, Verdanis (Terra 10, Terratin) had become a member planet of the Federation. (Star Trek: Star Charts, United Federation of Planets I & II)