At the 4 : 1 orbital resonance with Jupiter that lies at semi-major axes of 2.06 AU creating the innermost Kirkwood gap .
2.06 AU is any orbiting body is sufficiently strongly perturbed to be forced into an extremely eccentric and unstable orbit .
At the 4 : 1 orbital resonance with Jupiter that lies at semi-major axes of 2.06 AU , any orbiting body is sufficiently strongly perturbed to be forced into an extremely eccentric and unstable orbit , creating the innermost Kirkwood gap .