The Cybele group is a group of asteroids in the outer part of the main asteroid belt at a mean distance from the Sun of 3.4 astronomical units (AU), corresponding roughly to a 4:7 resonance with Jupiter. Along with the Jupiter Trojans, the Hilda group, and Thule, the Cybeles are thought to be remains of the original asteroid population that have remained in more-or-less the same orbital locations since the dawn of the solar system. The prototype, 65 Cybele, was discovered in 1861 by the German astronomer Wilhelm Tempel.