2017A&A...598L...7K


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.15CEST08:02:45

2017A&A...598L...7K - Astronomy and Astrophysics, volume 598, L7-7 (2017/2-1)

Proxima's orbit around α Centauri.

KERVELLA P., THEVENIN F. and LOVIS C.

Abstract (from CDS):

Proxima and α Centauri AB have almost identical distances and proper motions with respect to the Sun. Although the probability of such similar parameters is, in principle, very low, the question as to whether they actually form a single gravitationally bound triple system has been open since the discovery of Proxima one century ago. Owing to HARPS high-precision absolute radial velocity measurements and the recent revision of the parameters of the α Cen pair, we show that Proxima and α Cen are gravitationally bound with a high degree of confidence. The orbital period of Proxima is ~=550000yr. With an eccentricity of 0.50+0.08–0.09, Proxima comes within 4.3+1.1–0.9kau of α Cen at periastron, and is currently close to apastron (13.0+0.3–0.1kau). This orbital motion may have influenced the formation or evolution of the recently discovered planet orbiting Proxima, as well as circumbinary planet formation around α Cen.

Abstract Copyright: © ESO, 2017

Journal keyword(s): astrometry - proper motions - stars: individual: Proxima - stars: individual: alpha Cen - binaries: visual

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 L 372-58 PM* 03 35 59.6996745075 -44 30 45.725264343 16.22 14.98 13.07 11.45 9.47 M5.5V 70 0
2 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1981 0
3 V* V645 Cen Fl* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 884 0
4 NAME Proxima b Pl? 14 29 42.94853 -62 40 46.1631           ~ 154 0
5 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 790 0
6 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 863 1
7 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1106 0
8 ** LDS 494 ** 14 39 40.90 -60 50 06.5           ~ 5 0
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10995 0
10 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 622 2

    Equat.    Gal    SGal    Ecl

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2019.10.15-08:02:45

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