Cybele asteroids are a group of asteroids in the outer asteroid belt with a semi-major axis between 3.27 AU and 3.7 AU, an eccentricity less than 0.3, and an inclination less than 25°. The group is named for the asteroid 65 Cybele. As of 2010, the group is thought to have formed from the breakup of a larger object in the distant past.