Gliese 1 information

Gliese 1
Observation data; Epoch J2000 Equinox J2000
Constellation	Sculptor
Right ascension	00h 05m 24.4279s
Declination	−37° 21′ 26.503″
Apparent magnitude (V)	8.57
Characteristics
Spectral type	M2V
U−B color index	+1.04
B−V color index	+1.46
Variable type	BY Dra
Astrometry
Radial velocity (Rv)	+23.6±2 km/s
Proper motion (μ)	RA: +5,633.95 mas/yr ; Dec.: −2,336.69 mas/yr
Parallax (π)	230.0970 ± 0.0362 mas
Distance	14.175 ± 0.002 ly ; (4.3460 ± 0.0007 pc)
Absolute magnitude (MV)	10.35
Details
Mass	0.33±0.07 M☉
Radius	0.33±0.06 R☉
Luminosity	0.015+0.007; −0.005 L☉
Surface gravity (log g)	4.91 cgs
Temperature	3,478±68 K
Metallicity [Fe/H]	−0.26±0.09 dex
Rotation	60.1±5.7 d
Rotational velocity (v sin i)	4.8 km/s
Age	8.27 Gyr
Other designations
	CD−37°15492, CPD−37°9435, G 267-025, GJ 1, GC 49, GCTP 5817.00, HD 225213, HIP 439, LHS 1, LTT 23, NLTT 134, NSV 15017, SAO 192348
Database references
SIMBAD	data
	Gliese 1 Location of Gliese 1 in the constellation Sculptor;

Gliese 1 is a red dwarf in the constellation Sculptor, which is found in the southern celestial hemisphere. It is one of the closest stars to the Sun, at a distance of 14.2 light years. Because of its proximity to the Earth it is a frequent object of study and much is known about its physical properties and composition. However, with an apparent magnitude of about 8.6 it is too faint to be seen with the naked eye.

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^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
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[GaiaEDR3-7] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

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Observation data Epoch J2000 Equinox J2000
Constellation	Sculptor
Right ascension	00^h 05^m 24.4279^s^[1]
Declination	−37° 21′ 26.503″^[1]
Apparent magnitude (V)	8.57^[2]
Characteristics
Spectral type	M2V^[3]
U−B color index	+1.04^[4]
B−V color index	+1.46^[4]
Variable type	BY Dra^[5]
Astrometry

Radial velocity (R_v)	+23.6±2^[6] km/s
Proper motion (μ)	RA: +5,633.95^[1] mas/yr Dec.: −2,336.69^[1] mas/yr
Parallax (π)	230.0970 ± 0.0362 mas^[7]
Distance	14.175 ± 0.002 ly (4.3460 ± 0.0007 pc)
Absolute magnitude (M_V)	10.35^[8]

Details

Mass	0.33±0.07^[9] `M`_☉
Radius	0.33±0.06^[9] `R`_☉
Luminosity	0.015+0.007 −0.005^[9] `L`_☉
Surface gravity (log g)	4.91^[9] cgs
Temperature	3,478±68^[9] K
Metallicity [Fe/H]	−0.26±0.09^[9] dex
Rotation	60.1±5.7 d^[10]
Rotational velocity (v sin i)	4.8^[11] km/s
Age	8.27^[9] Gyr

Other designations
CD−37°15492, CPD−37°9435, G 267-025, GJ 1, GC 49, GCTP 5817.00, HD 225213, HIP 439, LHS 1, LTT 23, NLTT 134, NSV 15017, SAO 192348^[2]
Database references
SIMBAD	data
Gliese 1 Location of Gliese 1 in the constellation Sculptor

Gliese 1 information

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