Gliese 581

Gliese 581
Gliese 581 is located in the constellation Libra
Gliese 581 is located in the constellation Libra
Gliese 581
Location of Gliese 581 in the constellation Libra

Observation data
Epoch J2000.0      Equinox J2000.0
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]
Distance20.549 ± 0.004 ly
(6.300 ± 0.001 pc)
Absolute magnitude (MV)11.6[11]
Details
Mass0.295±0.010[12] M☉
Radius0.302±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
Temperature3,500±26[12] K
Metallicity [Fe/H]−0.08±0.07[12] dex
Rotation132.5±6.3 d[13] or 148.1±0.9 d[14]
Rotational velocity (v sin i)<2.0[12] km/s
Age9.5±1.5[14] 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[6]
Database references
SIMBADThe star
e
b
c
d
f (artifact)
g

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]

  1. ^ Smith, Yvette. "NASA and NSF-Funded Research Finds First Potentially Habitable Exoplanet". nasa.gov. NASA. Archived from the original on 10 March 2013. Retrieved 9 June 2016.
  2. ^ a b c d e 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. Archived from the original on 23 September 2021. Retrieved 27 April 2009.
  5. ^ 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.
  6. ^ a b "GJ 581". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 August 2008.
  7. ^ 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.
  8. ^ 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.
  9. ^ Bonfils page L15
  10. ^ Matthews, J. M.; et al. (2007). "MOST Exoplanet System Photometry" (PDF). p. 80. Archived (PDF) from the original on 7 October 2022. Retrieved 27 April 2009.
  11. ^ From apparent magnitude and parallax.
  12. ^ a b c d e f g Cite error: The named reference vonStauffenberg2024 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference mnras452_3_2745 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Engle2023 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Reylé2021 was invoked but never defined (see the help page).
  16. ^ "Gliese 581 and the Stellar Activity Problem". 3 July 2014. Archived from the original on 29 April 2019. Retrieved 16 December 2018.


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