|Orbital Distance||6.8 AU|
|Orbital Period||3.6 Earth Years|
|Day Length||10.3 Earth Hours|
One of Arcturus' hydrogen-helium gas giants, Eirene had infrastructure in place for fueling civilian and military starships with helium-3 and antiprotons. None of this infrastructure has survived the Reapers.
- Eirene is named after the Greek name for "Peace" ( Greek : Ειρήνη )