THE CLOSEST KNOWN FLYBY OF A STAR TO THE SOLAR SYSTEM

@article{Mamajek2015THECK,
  title={THE CLOSEST KNOWN FLYBY OF A STAR TO THE SOLAR SYSTEM},
  author={Eric E. Mamajek and Scott A. Barenfeld and Valentin D. Ivanov and Alexei Yu. Kniazev and Petri V{\"a}is{\"a}nen and Yuri Beletsky and Henri M. J. Boffin},
  journal={The Astrophysical Journal Letters},
  year={2015},
  volume={800}
}
Passing stars can perturb the Oort Cloud, triggering comet showers and potentially extinction events on Earth. We combine velocity measurements for the recently discovered, nearby, low-mass binary system WISE J072003.20-084651.2 (“Scholz’s star”) to calculate its past trajectory. Integrating the Galactic orbits of this ∼0.15 M⊙ binary system and the Sun, we find that the binary passed within only 52+23−14 kAU (0.25+0.11−0.07 pc) of the Sun 70+15−10 kya (1σ uncertainties), i.e., within the outer… 

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