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={E. Mamajek and S. Barenfeld and V. Ivanov and A. Kniazev and P. Vaisanen and Y. Beletsky and H. Boffin},
  journal={The Astrophysical Journal},
  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… Expand
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