Yadera Prime was the main planet in the Yadera planetary system. This system was located in the Gamma Quadrant. The planet was the homeworld of the Yaderans, a warp capable humanoid species. Circa 2350, the planet was conquered by the Dominion.(DS9: "Shadowplay")
According to the Star Trek: Star Charts, on pages 71 and 74, Yadera Prime was a Class M planet. This planet was annexed by the Dominion in 2340. The dominant species were the humanoid Yaderan. The Yaderan were warp capable in circa 2200. Their world orbited a Class G star. It had a magnitude of +3, which was 10 times brighter than Sol.