Yajj IV was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, the fourth planet in orbit of the Yajj star system.
History and specifics[]
Yajj IV was located in the Kamyar sector. In the year 2369, a Chodak dreadnought attacked Outpost Delta Zero Eight near this planet. The outpost fired photon torpedoes in defense, but was destroyed by the dreadnought's energy weapon. This marked Federation's first contact with the Chodak. (TNG video game: A Final Unity)