It was a planet located near Socorro with a wide diversity of cultures.
The planet Omman was created in When the Domino Falls, near Socorro. But after another planet Omman was mentioned in the Tion Cluster, the first was identified as Omman Minor by the The Essential Atlas Online Companion. Although it was published later, The Essential Reader's Companion didn't noticed this retcon.
- The Black Sands of Socorro
- The Complete Star Wars Encyclopedia
- The Essential Reader's Companion