Zeta Doradus system
From Halopedia, the Halo wiki
The Zeta Doradus System is a planetary system near UNSC controlled space. It contains many planets, almost all of which are ice worlds or gas giants, none of which are habitable. One exception however, it also contains the planet Onyx.
The UNSC cruiser Pillar of Autumn was refit to serve near Zeta Doradus in 2550.
It is the location of The Battle of Onyx was fought here in 2552.
