Table 1
Observed and inferred stellar parameters for Ross 128.
| Spectral type(1) | M4 | |
| Epoch(2) | 2000 | |
| Right ascension, α(2) | 11h47m44.3974s | |
| Declination, δ(2) | +00o48′16.395″ | |
| Parallaxe, π(2) | [mas] | 295.80 ± 0.54 |
| Distance, d(2) | [pc] | 3.3806 ± 0.0064 |
| Stellar photometry | ||
| V (3) | [mag] | 11.15 |
| J(4) | [mag] | 6.505 ± 0.023 |
| H(4) | [mag] | 5.945 ± 0.024 |
| K(4) | [mag] | 5.654 ± 0.024 |
Effective temperature,  |
[K] | 3192 ± 60 |
Mass,  |
[M⊙] | 0.168 ± 0.017 |
Radius,  |
[R⊙] | 0.1967 ± 0.0077 |
| Metallicity, [M/H](5) | − 0.02 ± 0.08 | |
| Luminosity, L⋆ | [L⊙] | 0.00362 ± 0.00039 |
 |
− 5.573 ± 0.082 | |
Rotation period,  |
[day] | 101, 121, 123 |
| Age, τ(9) | [Gyr] | ≳5 |
References. (1) Henry et al. (2002); (2) Gaia Collaboration 2016; (3) Landolt (1992); (4) Cutri et al. (2003); (5) Mann et al. (2015); (6) Astudillo-Defru et al. (2017a); (7) this work using ASAS photometry (see Sect. 4); (8) this work from RV (see Sect. 5); (9) Newton et al. (2016) given PRot.
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