Qqaba

Qqaba was the star that Omega and Rassilon detonated with the Hand of Omega to create the black hole necessary to enable time travel. Qqaba was the last of the Population III stars. (DWM: Star Death, PDA: The Infinity Doctors)

It was located 9.6 light-years from Gallifrey in the constellation of Ao, in the Veil Nebula. (NA: Lungbarrow)