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2016A&A...595L..10B - Astronomy and Astrophysics, volume 595, L10-10 (2016/11-1)

Gliese 710 will pass the Sun even closer. Close approach parameters recalculated based on the first Gaia data release.

BERSKI F. and DYBCZYNSKI P.A.

Abstract (from CDS):

Context. First results based on Gaia data show that the well-known star Gliese 710 will be the closest flyby star in the next several Myrs and its minimum distance from the Sun will be almost five times smaller than that suggested by pre-Gaia solution.
Aims. The aim of this work is to investigate the proximity parameters and the influence of the close approach of Gliese 710 on the basis of Gaia DR1. Furthermore, we compare new results with previous works based on HIP2 and Tycho 2 catalogues to demonstrate how Gaia improves the accuracy of determination of such phenomena.
Methods. Using a numerical integration in an axisymmetric Galactic model, we determine new parameters of the close encounter for Gliese 710. Adding ten thousand clones drawn with the use of a covariance matrix, we estimate the most probable position and velocity of this star at the minimum distance from the Sun.
Results. Our calculations show that Gliese 710 will pass 13365AU from the Sun in 1.35Myr from now. At this proximity it will have the brightness of -2.7mag and a total proper motion of 52.28 arcsec per year. After the passage of Gliese 710 we will observe a large flux of new long-period comets. Thanks to the Gaia mission, the uncertainties of the minimum distance and time of the close approach are several times smaller than suggested by previous works based on data from earlier observations.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: individual: GJ 710 - stars: kinematics and dynamics - solar neighborhood - Oort Cloud

Simbad objects: 4

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