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Table 2
Stellar parameters of GJ 581.
| Parameters | Values | References |
|
|
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| RA ICRS(2000) | 15h19m27.509s | Høg et al. (2000) |
| Dec ICRS(2000) | −07°43′19.44′′ | ′′ |
| μαcosδ | −1.228′′/yr | ′′ |
| μ δ | −0.098′′/yr | ′′ |
| Galactic longitude | 354.08° | ′′ |
| Galactic latitude | + 40.01° | ′′ |
| Distance | 6.338 ± 0.071 pc | Phillips et al. (2010) |
| Spectral type | M3.0 | Reid et al. (1995) |
| Radius | 0.299 ± 0.010 R⊙ | von Braun et al. (2011) |
| Mass | 0.28 M⊙ | ′′ |
| Bolometric lum. | 1.22 ± 0.02 × 10-2 L⊙ | ′′ |
| Effective temp. | 3498 ± 56 K | ′′ |
| Metallicity [Fe/H] | −0.25 | Bonfils et al. (2005) |
| v sin i | < 2.1 km s-1 | Delfosse et al. (1998) |
| Rotation period | 93.2 ± 1 days | Vogt et al. (2010) |
| Log LX (ergs/s) | < 26.44 | Schmitt et al. (1995) |
| Age | 2–8 Gyr | see Sect. 3 |
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