The Cybele asteroids (also known as the "Cybeles") are a dynamical group of asteroids, named after the asteroid 65 Cybele.[1] Considered by some as the last outpost of an extended asteroid belt, the group consists of just over 2000 members and a few collisional families.[2][3] The Cybeles are in a 7:4 orbital resonance with Jupiter. Their orbit is defined by an osculating semi-major axis of 3.27 to 3.70 AU,[2] with an eccentricity of less than 0.3,[1] and an inclination less than 30°.[2]
The dynamical Cybele group is located adjacent to the outermost asteroid belt, beyond the Hecuba gap – the 2:1 resonant zone with Jupiter, where the Griqua asteroids are located – and inside the orbital region of the Hilda asteroids (3:2 resonance), which are themselves followed by the Jupiter trojans (1:1 resonance) further out.
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