Sontar system

The Sontar system was the star system containing the planet Sontar, the Sontaran homeworld. In an alternate timeline, the Cybermen had invaded the system to attack at Sontar directly. (COMIC: Supremacy of the Cybermen)

Sontar originally orbited its star like any other planet, but by 1609 it had been modified so that the star orbited Sontar, as a more "logical" pattern. (PROSE: The Empire of Glass)