Bajor IV was the fourth planet in the Bajoran system. It was smaller in size than the planet Bajor. (DS9: "The Nagus")

In 2372, the position and orbital path of Bajor IV was illustrated on a tactical cartography map displayed in the wardroom of Deep Space 9. (DS9: "Sons of Mogh", okudagram)

"BAY-jor" was the pronunciation for this planet's name from the script pronunciation guide for "Emissary".
According to Star Trek: Star Charts (pages 42, 46) Bajor IV was classified as a B-class planet.
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