Gliese 581
Star in the constellation Libra / From Wikipedia, the free encyclopedia
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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 Libra constellation. Its estimated mass is about a third of that of the Sun, and it is the 101st closest known star system to the Sun.[15] 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.[16]
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Location of Gliese 581 in the constellation Libra | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Libra[1] |
Right ascension | 15h 19m 26.82694s[2] |
Declination | −07° 43′ 20.1895″[2] |
Apparent magnitude (V) | 10.56 to 10.58[note 1] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | M3V[5] |
B−V color index | 1.61[6] |
Variable type | BY Dra[7][note 2] |
Astrometry | |
Radial velocity (Rv) | −9.75±0.16[2] km/s |
Proper motion (μ) | RA: −1221.278(37) mas/yr[2] Dec.: −97.229(27) mas/yr[2] |
Parallax (π) | 158.7183 ± 0.0301 mas[2] |
Distance | 20.549 ± 0.004 ly (6.300 ± 0.001 pc) |
Absolute magnitude (MV) | 11.6[11] |
Details | |
Mass | 0.295±0.010[12] M☉ |
Radius | 0.302±0.005[12] R☉ |
Luminosity (bolometric) | 0.012365(68)[12] L☉ |
Luminosity (visual, LV) | 0.002[note 3] L☉ |
Surface gravity (log g) | 4.97±0.11[12] cgs |
Temperature | 3,500±26[12] K |
Metallicity [Fe/H] | −0.08±0.07[12] dex |
Rotation | 132.5±6.3 d[13] or 148.1±0.9 d[14] |
Rotational velocity (v sin i) | <2.0[12] km/s |
Age | 9.5±1.5[14] Gyr |
Other designations | |
Database references | |
SIMBAD | The star |
e | |
b | |
c | |
d | |
f (artifact) | |
g |
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