Chi Ceti system

The Chi Ceti System is a planetary system located in the far reaches of UNSC-controlled space, approximately 80 light years from Earth. It was home to the planet Chi Ceti IV, which housed the Damascus Testing Facility where the MJOLNIR Powered Assault Armor was first created.

History
In 2525, the Battle of Chi Ceti was fought here between the and the Covenant light cruiser Unrelenting. The facility on Chi Ceti IV was evacuated shortly thereafter, along with the MJOLNIR armor. In this battle, the Spartans successfully destroyed the Covenant ship, though Samuel-034 died in the process. It is unknown whether Chi Ceti IV was glassed by the Covenant or not.

Trivia

 * Chi Ceti (aka 53 Ceti) is an actual star system approximately 80 light years from Earth.