Gliese 581
Location of Gliese 581 in the constellation Libra | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 19m 26.82694s |
| Declination | −07° 43′ 20.1895″ |
| Apparent magnitude (V) | 10.56 to 10.58 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M3V |
| B−V color index | 1.61 |
| Variable type | BY Dra |
| Astrometry | |
| Radial velocity (Rv) | −9.75±0.16 km/s |
| Proper motion (μ) | RA: −1221.278(37) mas/yr Dec.: −97.229(27) mas/yr |
| Parallax (π) | 158.7183±0.0301 mas |
| Distance | 20.549 ± 0.004 ly (6.300 ± 0.001 pc) |
| Absolute magnitude (MV) | 11.6 |
| Details | |
| Mass | 0.295±0.010 M☉ |
| Radius | 0.302±0.005 R☉ |
| Luminosity (bolometric) | 0.012365(68) L☉ |
| Luminosity (visual, LV) | 0.002 L☉ |
| Surface gravity (log g) | 4.97±0.11 cgs |
| Temperature | 3,500±26 K |
| Metallicity [Fe/H] | −0.08±0.07 dex |
| Rotation | 132.5±6.3 d or 148.1±0.9 d |
| Rotational velocity (v sin i) | <2.0 km/s |
| Age | 9.5±1.5 Gyr |
| Other designations | |
| HO Lib, BD−07 4003, GJ 581, HIP 74995, LFT 1195, LHS 394, LPM 564, LTT 6112, NLTT 39886, Wolf 562, TIC 36853511, TYC 5594-1093-1 | |
| Database references | |
| SIMBAD | The star |
| e | |
| b | |
| c | |
| d | |
| f (artifact) | |
| g | |
| Exoplanet Archive | data |
Gliese 581 (/ˈɡliːzə/) is a red dwarf star of spectral type M3V which hosts a planetary system, 20.5 light-years (6.3 parsecs) away from Earth in the constellation Libra. Its estimated mass is about a third of that of the Sun, and it is the 101st closest known star system to the Sun. Gliese 581 is one of the oldest, least active M dwarfs known. Its low stellar activity improves the likelihood of its planets retaining significant atmospheres, and lessens the sterilizing impact of stellar flares.