Plutino (15810) 1994 JR1, an accidental quasi-satellite of Pluto

@article{Marcos2012Plutino1,
  title={Plutino (15810) 1994 JR1, an accidental quasi-satellite of Pluto},
  author={Carlos de la Fuente Marcos and Ra{\'u}l de la Fuente Marcos},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
  year={2012},
  volume={427}
}
In the Solar system, quasi-satellites move in a 1:1 mean motion resonance going around their host body like a retrograde satellite but their mutual separation is well beyond the Hill radius and the trajectory is not closed as they orbit the Sun, not the host body. Although they share the semi-major axis and the mean longitude of their host body, their eccentricity and inclination may be very different. So far, minor bodies temporarily trapped in the quasi-satellite dynamical state have been… 
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