Theta Anterial II was an inhabited planet, the second planet of the Theta Anterial system, located in the galaxy's Alpha or Beta Quadrants.
History and specifics[]
The family of George Samuel Kirk, Jr. and Aurelan Kirk resided on Theta Anterial II in the early 2250s decade. The planet's day was 18 hours long.
In early 2254, George contacted his brother James T. Kirk via subspace communications from Theta Anterial II to introduce him to his nephew Peter Kirk, who at the time was 22 months old. (TOS eBook: Shadow of the Machine)