Proxima’s orbit around Centauri | Astronomy & Astrophysics (A&A)

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Table 2

Positional data, parallax, and radial velocity of α Centauri AB (barycenter) and Proxima.

Object	α ± σ_α	δ ± σ_δ	ϖ	μ _α	μ _δ	v _{r, abs}
	(h:m:s ± mas)	(d:m:s ± mas)	(mas)	(mas a^-1)	(mas a^-1)	(km s^-1)

α Cen	14:39:40.2068 ±25^a	–60:50:13.673 ±19^a	747.17 ± 0.61 ^b	−3619.9 ± 3.9 ^b	+ 693.8 ± 3.9 ^b	−22.332 ± 0.005 ^b
Proxima	14:29:47.7474 ±1.3^a	–62:40:52.868 ±1.5^a	768.77 ± 0.37 ^c	−3773.8 ± 0.4 ^c	+ 770.5 ± 2.0 ^c	−22.204 ± 0.032 ^d

Notes.The coordinates are expressed in the ICRS for the Hipparcos epoch (1991.25). The barycentric radial velocity v_{r, abs} is corrected for the convective blueshift and gravitational redshift.

Reference.

^(a)

ESA (1997);

^(b)

Kervella et al. (2016b);

^(c)

Benedict et al. (1999);

^(d)

Present work.

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