Hilda asteroids are in a 3:2 resonance of mean motion with Jupiter. This enables them to have aphelia up to the distance of Jupiter and not beeing scattered. They form a typical triangle.

A JavaScript implementation of the simulations presented in the paper Collective Motion of Moshers at Heavy Metal Concerts.
A JavaScript implementation of the simulations presented in the paper Collective Motion of Moshers at Heavy Metal Concerts.

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Reference:

  1. Asteroid (and Comet) Groups
  2. Moshpits Simulation