Soell system

Soell is the star that Threshold, Basis and Installation 04 orbit.

Overview
The star's location in the galaxy is unknown. Prior to Halo's release, some speculated and theorized that it was factually the star Iota Horologii (roughly 55 light-years from Earth ), based on lateral hints from Bungie that the star was connected to the game somehow (specifically a sign left in front of the Bungie Webcam).