Discovery of 12 satellites of Saturn exhibiting orbital clustering

@article{Gladman2001DiscoveryO1,
  title={Discovery of 12 satellites of Saturn exhibiting orbital clustering},
  author={Brett J. Gladman and JJ. Kavelaars and Matthew J. Holman and Philip D. Nicholson and Joseph A. Burns and Carl W. Hergenrother and J. M. Petit and Brian Geoffrey Marsden and Robert A. Jacobson and William Gray and Tommy Grav},
  journal={Nature},
  year={2001},
  volume={412},
  pages={163-166}
}
The giant planets in the Solar System each have two groups of satellites. The regular satellites move along nearly circular orbits in the planet's orbital plane, revolving about it in the same sense as the planet spins. In contrast, the so-called irregular satellites are generally smaller in size and are characterized by large orbits with significant eccentricity, inclination or both. The differences in their characteristics suggest that the regular and irregular satellites formed by different… 

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