Y'Deio is an yellow dwarf star located 41 light years from Earth, within Covenant territory. It is the only known Covenant star system discovered centuries ago by humanity, and is referred to in human astronomy as HD 69830.
Y'Deio has a planetary system consisting of three planets and an asteroid field. The Kig-Yar homeworld of Eayn orbits the third planet, Chu'ot, a gas giant. Further out is an asteroid belt, with a number of Kig-Yar colonies built on small planetoids and asteroids.