Plausible Home Stars of the Interstellar Object ‘Oumuamua Found in Gaia DR2

  title={Plausible Home Stars of the Interstellar Object ‘Oumuamua Found in Gaia DR2},
  author={Coryn A. L. Bailer-Jones and Davide Farnocchia and Karen J. Meech and Ramon Brasser and Marco Micheli and Sukanya Chakrabarti and Marc W. Buie and Olivier R. Hainaut},
  journal={The Astronomical Journal},
The first detected interstellar object 'Oumuamua that passed within 0.25au of the Sun on 2017 September 9 was presumably ejected from a stellar system. We use its newly determined non-Keplerian trajectory together with the reconstructed Galactic orbits of 7 million stars from Gaia DR2 to identify past close encounters. Such an "encounter" could reveal the home system from which 'Oumuamua was ejected. The closest encounter, at 0.60pc (0.53-0.67pc, 90% confidence interval), was with the M2.5… Expand

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