Arhennius

Arhennius was a star in or near Federation space, and the center of the Arhennius system. Arhennius was a quarter more massive than Sol, with twice the energy output.

In 2370, retired Starfleet Captain Montgomery Scott obtained a Klingon bird-of-prey and planned to travel back in time and rescue James T. Kirk from the USS Enterprise (NCC-1701-B) and save him from apparent death, and used the Arhennius star to slingshot back in time, with the USS Enterprise (NCC-1701-D) following.

Andor was the Federation world closest to Arhennius along a direct route between the star and Earth.