HIP 21539 is not a past very close neighbour of the Sun
1 GEPI, Observatoire de Paris, PSL Research University, CNRS, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92190 Meudon, France
2 Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, France
3 LUPM, UMR CNRS/Université de Montpellier, CC 72, Université de Montpellier, 34095 Montpellier Cedex 05, France
Received: 30 January 2017
Accepted: 1 March 2017
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.
Key words: solar neighborhood / techniques: radial velocities / catalogs / stars: kinematics and dynamics
© ESO, 2017