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. (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, and was the last of the Population III stars. (NA: Lungbarrow)