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The Ianane system was a star system located amidst the hyperspace anomalies west of the Core Worlds. It contained at least three planets, including Ianane III, whose brightness led to it being mistaken for a stellar companion for its star. It was also the site of the Ianane Ring, an ring-shaped object as black as Ianane III was white.
Sources
Star Wars: The Essential Atlas Online Companion on StarWars.com (article) (backup link)- The Essential Guide to Warfare (Cut)
Star Wars: The Essential Guide to Warfare Author's Cut — The Celestials on StarWars.com (article) (backup link) (First mentioned)