A retrograde co-orbital asteroid of Jupiter

@article{Wiegert2017ARC,
  title={A retrograde co-orbital asteroid of Jupiter},
  author={Paul A. Wiegert and Martin G. Connors and Christian Veillet},
  journal={Nature},
  year={2017},
  volume={543},
  pages={687-689}
}
Recent theoretical work in celestial mechanics has revealed that an asteroid may orbit stably in the same region as a planet, despite revolving around the Sun in the sense opposite to that of the planet itself. Asteroid 2015 BZ509 was discovered in 2015, but with too much uncertainty in its measured orbit to establish whether it was such a retrograde co-orbital body. Here we report observations and analysis that demonstrates that asteroid 2015 BZ509 is indeed a retrograde co-orbital asteroid of… 
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