The Ilum system was a star system in the 7G sector of the Unknown Regions that contained the ice planet Ilum in its fifth position, which was important in the training of Jedi younglings, as well as an airless planet furthest from the system's center. The system had one star,a blue dwarf named Asar that was extremely bright for its star type. Located further out in the system was a cometary cloud.
- Star Wars: The Clone Wars – "The Gathering" (First appearance)
- Star Wars: The Clone Wars – "A Test of Strength" (Appears in flashback(s))