Collisional Origin of Families of Irregular Satellites

@article{Nesvorn2004CollisionalOO,
  title={Collisional Origin of Families of Irregular Satellites},
  author={David Nesvorn{\'y} and Cristi{\'a}n Beaug{\'e} and Luke Dones},
  journal={The Astronomical Journal},
  year={2004},
  volume={127},
  pages={1768 - 1783}
}
A distinctive feature of the irregular moons of the giant planets is their orbital grouping. Previously, the prograde and retrograde groups of irregular moons at Jupiter were believed to be groups of fragments produced by the disruption of two large moons. More recently, we have shown that the retrograde group has not one but probably four or more parent bodies. We also found that fragments were launched from two of the four identified parent moons, producing two clusters of irregular moons… 

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