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Table 1.
Main parameters of Barnard’s Star and Barnard’s Star b.
| Parameter name | Symbol | Value | References |
|---|---|---|---|
| (units) | |||
| Barnard’s Star | |||
| Mass | m⋆ (M⊙) | 0.16 ± 0.02 | 1, 3 |
| Center-of-mass RV | γ (km s−1) | − 110.5 ± 0.1 | 2, 3 |
| G magnitude | G (mag) | 8.195 ± 0.002 | 4 |
| Parallax | ϖ (mas) | 547.45 ± 0.29 | 4 |
| Proper motion in RA | μα (mas yr−1) | − 802.8 ± 0.6 | 4 |
| Proper motion in Dec | μδ (mas yr−1) | 10362.5 ± 0.4 | 4 |
| Barnard’s Star b | |||
| Orbital period | P (d) | 232.8 ± 0.4 | 1 |
| RV semiamplitude | K (m s−1) | 1.20 ± 0.12 | 1 |
| Eccentricity | e | <0.42 | 1 |
| Argument of periastron | ω (°) | 106 ± 21 | 1 |
| Min. mass | mp sin i (M⊕) | 3.23 ± 0.44 | 1 |
| Min. astrometric signature | α sin i (μas) | 13.3 ± 1.3 | 1 |
References. (1) Ribas et al. (2018); (2) Nidever et al. (2002); (3) Reiners et al. (2018); (4) Gaia Collaboration (2018a).
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