HIP 21539 is not a past very close neighbour of the Sun

Abstract : Aims: A previous study claimed that the star HIP 21539 passed close to the Sun, at a distance of 1.9 pc, around 0.14 Myr ago. We show that this is not the case. Methods: We redetermined the trajectory of the star relative to the Sun using a new accurate radial velocity from the HARPS spectrograph combined with the recent Gaia-TGAS astrometry. Results: With this new data, the closest approach of HIP 21539 to the Sun is now 17 pc, instead of 1.9 pc. Conclusions: At this distance, the star has not perturbed the Oort cloud.
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Astronomy and Astrophysics - A&A, EDP Sciences, 2017, 601, pp.id.L6. 〈10.1051/0004-6361/201730521〉
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https://hal.archives-ouvertes.fr/hal-01509496
Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 18 avril 2017 - 09:54:32
Dernière modification le : mardi 10 octobre 2017 - 16:16:26

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F. Crifo, C. Soubiran, G. Jasniewicz, D. Katz, P. Sartoretti, et al.. HIP 21539 is not a past very close neighbour of the Sun. Astronomy and Astrophysics - A&A, EDP Sciences, 2017, 601, pp.id.L6. 〈10.1051/0004-6361/201730521〉. 〈hal-01509496〉

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