(written from a Production point of view)
This planet originated in the biography of Lt. M'ress, which was originally published by Lincoln Enterprises in 1974, and described the planet as having an atmosphere, mass, and gravity all near Earth normal (Class M). There was only one other planet in the system, and it was uninhabited.
The Worlds of the Federation (p. 38) adds that Cait is the second planet in the orbit of star 15 Lyncis, and is known natively as "Ferasa", which had two moons Rea and Sura. This source also states that the 15 Lyncis system was the twelfth Federation member to ratify the Constitution of the United Federation of Planets and its component Articles Of Federation.