Sigma Octanus system

Summary
Sigma Octanus is a system of planets in FLEETCOM Sector Three with over 3 million people on Sigma Octanus IV. The Keyes Loop and The Battle of Sigma Octanus IV occurred here in 2552. Master Chief also found a strange Forerunner artifact in Côte d'Azur's museum, on Sigma Octanus IV.

Stats

 * 121 light years from the Southern Pole star as viewed from Earth.
 * Though likely the same star, the name is actually spelled as Octanis, without the u.