Another cold planet within the Yunkor system, Yunkor IV is home to some of the richest mining deposits of all its neighbors. The entire planet is cold barren rock and was home to nothing more than bacteria and other microorganisms. Yunkor IV is believed to have formed late into the birth of the binary system. Collecting leftover gases and the collisions of millions, perhaps even billions of asteroids, Yunkor IV formed into a near-solid rock with a mildly toxic atmosphere. The impact of so many asteroids should have been apparent by the presence of immense craters, but an extremely strong gravity has evened out the landmasses and flattened the surface.
Yunkor IV's gravity is a significant impediment to space travel as it's well extends beyond the normal range for such a planet. Travelers attempting to skirt by the planet at a normally safe distance will often find themselves inexplicably in normal space as their hyperdrive registers nearby mass.