Ord Sedra was colonized by the Galactic Republic as an Ordnance/Regional Depot sometime before the Pius Dea Era.
It was an Imperial Remnant planet liberated from the Yuuzhan Vong by the combined efforts of Kyle Katarn, Jan Ors, and Imperial Remnant troops under Lieutenant Pallin. After the end of the Yuuzhan Vong War, Katarn returned to the world, finding clues that led him to believe the Sith survived in the Cloak of the Sith.
The planet's name was derived from the real world planetoid Sedna, which was discovered in November 2003, just a few months before the writer of Equals and Opposites was offered the job.