Abstract
An incomplete arc ring has recently been discovered around Neptune1. Here, a model to explain the confinement of this ring is developed. The ring may be azimuthally confined near a triangular (Trojan) point of an undiscovered satellite of Neptune. Radial diffusion of the ring particles can be prevented by shepherding torques of another moon. Two satellites with diameters of 100–200 km would be sufficient to confine the ring; such moons would be too small to have been photographed from Earth.
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Lissauer, J. Shepherding model for Neptune's arc ring. Nature 318, 544–545 (1985). https://doi.org/10.1038/318544a0
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DOI: https://doi.org/10.1038/318544a0
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