Gliese 809

Last updated
Gliese 809
Observation data
Epoch J2000       Equinox J2000
Constellation Cepheus [1]
Right ascension 20h 53m 19.78892s [2]
Declination +62° 09′ 15.8173″ [2]
Apparent magnitude  (V)8.54 [3]
Characteristics
Evolutionary stage main sequence [3]
Spectral type M2V [3]
Astrometry
Radial velocity (Rv)−17.30±0.09 [4] km/s
Proper motion (μ)RA: 0.259 mas/yr [2]
Dec.: −773.096 mas/yr [2]
Parallax (π)142.0543±0.0160  mas [2]
Distance 22.960 ± 0.003  ly
(7.0396 ± 0.0008  pc)
Absolute magnitude  (MV)8.46 [1]
Details
Mass 0.54 [5]   M☉
Radius 0.54 [6]   R☉
Luminosity 0.05 [6]   L☉
Surface gravity (log g)4.72 [5]   cgs
Temperature 3,729 [6]   K
Metallicity [Fe/H]−0.21 [5]   dex
Rotational velocity (v sin i)2.8 [3]  km/s
Age 12.3 [5]   Gyr
Other designations
BD+61°2068, GJ 809, HD 199305, HIP 103096 [7]
Database references
SIMBAD data
ARICNS data

Gliese 809 is a red dwarf star in the constellation Cepheus. A visual magnitude of 8.55 makes it too faint to see with the naked eye. It is part of the Gliese Catalogue of Nearby Stars and is located about 23 light-years (ly) from the Solar System. Gliese 809 has about 70.5% the radius of the Sun and 61.4% [3] of the Sun's mass. It has a metallicity of −0.06, which means that the abundance of elements other than hydrogen and helium is just 87.1% that of the Sun.

This is a high proper motion star that moves about 0.77 arcseconds per year relative to background stars. [7] In physical terms it is travelling with a space velocity of 31.1 km/s relative to the Solar System. [8] The galactic orbit of this star carries it 21,300 ly from the Galactic Center at its perigee to 30,600 ly at its apogee. The orbital eccentricity is 17.8% with the semi-major axis of 25,956 ly and a semi-minor axis of 25,542 ly. [8]

Gliese 809 forms an optical double with the 9th magnitude star BD+61°2067, but this is an unrelated background star. [9]

See also

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. (October 2009), "Rotational Velocities for M Dwarfs", The Astrophysical Journal, 704 (2): 975–988, arXiv: 0908.4092 , Bibcode:2009ApJ...704..975J, doi:10.1088/0004-637X/704/2/975, S2CID   119203469.
  4. ↑ Nidever, David L.; et al. (August 2002), "Radial Velocities for 889 Late-Type Stars", The Astrophysical Journal Supplement Series, 141 (2): 503–522, arXiv: astro-ph/0112477 , Bibcode:2002ApJS..141..503N, doi:10.1086/340570, S2CID   51814894.
  5. 1 2 3 4 Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar (2017), "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library", The Astrophysical Journal, 836 (1): 77, arXiv: 1701.00922 , Bibcode:2017ApJ...836...77Y, doi: 10.3847/1538-4357/836/1/77 .
  6. 1 2 3 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023), "Variability Catalog of Stars Observed during the TESS Prime Mission", The Astrophysical Journal Supplement Series, 268 (1): 4, arXiv: 2208.11721 , Bibcode:2023ApJS..268....4F, doi: 10.3847/1538-4365/acdee5 .
  7. 1 2 "GJ 809". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2015-07-06.
  8. 1 2 Gliese 809 (HIP 103096), Ashland Astronomy Studio, archived from the original on 15 April 2014, retrieved 28 March 2014.
  9. ↑ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
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