Qqaba

From TARDIS Index File, the free Doctor Who reference.

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)