Gliese 581 information

Gliese 581
	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±0.037 mas/yr ; Dec.: −97.229±0.027 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	0.307±0.007 M☉
Radius	0.310±0.008 R☉
Luminosity (bolometric)	0.01192±0.00010 L☉
Luminosity (visual, LV)	0.002 L☉
Surface gravity (log g)	4.92±0.10 cgs
Temperature	3,424+43; −42 K
Metallicity [Fe/H]	−0.33 ± 0.12 dex
Rotation	132.5±6.3 d
Age	8+3; −1 Gyr
Other designations
	HO Librae, HO Lib, BD−07°4003, GJ 581, HIP 74995, LFT 1195, LHS 394, LPM 564, LTT 6112, NLTT 39886, TYC 5594-1093-1, Wolf 562.
Database references
SIMBAD	The star
	e
	b
	c
	d
	f (artifact)
	g

Gliese 581 (/ˈɡliːzə/) is a red dwarf star of spectral type M3V at the center of the Gliese 581 planetary system, about 20.5 light years 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.^[18] 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.^[19]

^ Smith, Yvette. "NASA and NSF-Funded Research Finds First Potentially Habitable Exoplanet". nasa.gov. NASA. Retrieved 9 June 2016.
^ ^a ^b ^c ^d ^e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ Lopez-Morales, M.; et al. (2006). "Limits to Transits of the Neptune-mass planet orbiting Gl 581". Publications of the Astronomical Society of the Pacific. 118 (849): 1506–1509. arXiv:astro-ph/0609255. Bibcode:2006PASP..118.1506L. doi:10.1086/508904. S2CID 15156619. V* HO Lib ... BY Draconis (page 2 of pre-print submitted 9 September 2006)
^ "General Catalogue of Variable Stars Query results". Sternberg Astronomical Institute. Retrieved 27 April 2009.
^ Bonfils, Xavier; Forveille, Thierry; Delfosse, Xavier; Udry, Stéphane; Mayor, Michel; Perrier, Christian; Bouchy, François; Pepe, Francesco; Queloz, Didier; Bertaux, Jean-Loup (2005). "The HARPS search for southern extra-solar planets VI: A Neptune-mass planet around the nearby M dwarf Gl 581". Astronomy and Astrophysics. 443 (3): L15–L18. arXiv:astro-ph/0509211. Bibcode:2005A&A...443L..15B. doi:10.1051/0004-6361:200500193. S2CID 59569803.
^ ^a ^b "GJ 581". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 August 2008.
^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ Weis, E. W. (1994). "Long term variability in dwarf M stars". The Astronomical Journal. 107 (3): 1138. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.
^ Bonfils page L15
^ Matthews, J. M.; et al. (2007). "MOST Exoplanet System Photometry" (PDF). p. 80. Retrieved 27 April 2009.
^ From apparent magnitude and parallax.
^ ^a ^b ^c ^d Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference apj653 was invoked but never defined (see the help page).
^ Cite error: The named reference mnras452_3_2745 was invoked but never defined (see the help page).
^ "Star: Gliese 581". Extrasolar Planets Encyclopaedia. Archived from the original on 10 May 2012. Age 8+3
−1 Gyr
^ Selsis 3.4-page 1382 "lower limit of the age that, considering the associated uncertainties, could be around 7 Gyr", "preliminary estimate", "should not be above 10–11 Gyr"
^ "Entry 5594-1093-1". The Hipparcos and Tycho Catalogues. Centre de données astronomiques de Strasbourg. ID I/239.
^ Cite error: The named reference Reylé2021 was invoked but never defined (see the help page).
^ "Gliese 581 and the Stellar Activity Problem". 3 July 2014.

Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).

[NASA-1] Smith, Yvette. "NASA and NSF-Funded Research Finds First Potentially Habitable Exoplanet". nasa.gov. NASA. Retrieved 9 June 2016.

[GaiaDR3-2] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[3] Lopez-Morales, M.; et al. (2006). "Limits to Transits of the Neptune-mass planet orbiting Gl 581". Publications of the Astronomical Society of the Pacific. 118 (849): 1506–1509. arXiv:astro-ph/0609255. Bibcode:2006PASP..118.1506L. doi:10.1086/508904. S2CID 15156619. V* HO Lib ... BY Draconis (page 2 of pre-print submitted 9 September 2006)

[4] "General Catalogue of Variable Stars Query results". Sternberg Astronomical Institute. Retrieved 27 April 2009.

[bonfils-6] Bonfils, Xavier; Forveille, Thierry; Delfosse, Xavier; Udry, Stéphane; Mayor, Michel; Perrier, Christian; Bouchy, François; Pepe, Francesco; Queloz, Didier; Bertaux, Jean-Loup (2005). "The HARPS search for southern extra-solar planets VI: A Neptune-mass planet around the nearby M dwarf Gl 581". Astronomy and Astrophysics. 443 (3): L15–L18. arXiv:astro-ph/0509211. Bibcode:2005A&A...443L..15B. doi:10.1051/0004-6361:200500193. S2CID 59569803.

[sb0-7] "GJ 581". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 August 2008.

[gcvs-8] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

[9] Weis, E. W. (1994). "Long term variability in dwarf M stars". The Astronomical Journal. 107 (3): 1138. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.

[10] Bonfils page L15

[11] Matthews, J. M.; et al. (2007). "MOST Exoplanet System Photometry" (PDF). p. 80. Retrieved 27 April 2009.

[13] From apparent magnitude and parallax.

[Pineda2021-14] Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).

[apj653-16] Cite error: The named reference apj653 was invoked but never defined (see the help page).

[mnras452_3_2745-17] Cite error: The named reference mnras452_3_2745 was invoked but never defined (see the help page).

[epe-18] "Star: Gliese 581". Extrasolar Planets Encyclopaedia. Archived from the original on 10 May 2012. Age 8+3
−1 Gyr

[19] Selsis 3.4-page 1382 "lower limit of the age that, considering the associated uncertainties, could be around 7 Gyr", "preliminary estimate", "should not be above 10–11 Gyr"

[catl-20] "Entry 5594-1093-1". The Hipparcos and Tycho Catalogues. Centre de données astronomiques de Strasbourg. ID I/239.

[Reylé2021-21] Cite error: The named reference Reylé2021 was invoked but never defined (see the help page).

[auto-22] "Gliese 581 and the Stellar Activity Problem". 3 July 2014.

Observation data Epoch J2000.0 Equinox J2000.0
Gliese 581 Location of Gliese 581 in the constellation Libra
Constellation	Libra^[1]
Right ascension	15^h 19^m 26.82694^s^[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 (R_v)	−9.75±0.16^[2] km/s
Proper motion (μ)	RA: −1221.278±0.037 mas/yr^[2] Dec.: −97.229±0.027 mas/yr^[2]
Parallax (π)	158.7183 ± 0.0301 mas^[2]
Distance	20.549 ± 0.004 ly (6.300 ± 0.001 pc)
Absolute magnitude (M_V)	11.6^[11]

Details

Mass	0.307±0.007^[12] `M`_☉
Radius	0.310±0.008^[12] `R`_☉
Luminosity (bolometric)	0.01192±0.00010^[12] `L`_☉
Luminosity (visual, L_V)	0.002^{[note 3]} `L`_☉
Surface gravity (log g)	4.92±0.10^[13] cgs
Temperature	3,424+43 −42^[12] K
Metallicity [Fe/H]	−0.33 ± 0.12^[13] dex
Rotation	132.5±6.3 d^[14]
Age	8+3 −1^[15]^[16] Gyr

Other designations
HO Librae, HO Lib, BD−07°4003, GJ 581, HIP 74995, LFT 1195, LHS 394, LPM 564, LTT 6112, NLTT 39886, TYC 5594-1093-1, Wolf 562.^[6]^[17]
Database references
SIMBAD	The star
	e
	b
	c
	d
	f (artifact)
	g

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