HIP 21539 is not a past very close neighbour of the Sun
arXiv:1704.00364 · doi:10.1051/0004-6361/201730521
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.
2 pages, accepted as a Letter by A&A
References in corpus (5)
- Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
- Close encounters of the stellar kind
- The catalogue of radial velocity standard stars for Gaia I. Pre-launch release
- On the accuracy of close stellar approaches determination
- The AMBRE Project: Parameterisation of FGK-type stars from the ESO:HARPS archived spectra