Gliese 809

Gliese 809 is a red dwarf star in the constellation Cepheus,[5] forming the primary component of a multi-star system. 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%[6] the radius of the Sun and 61.4%[2] 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.[2]

Gliese 809
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 20h 53m 19.79051s[1]
Declination +62° 09′ 15.8028″[1]
Apparent magnitude (V) 8.54[2]
Characteristics
Spectral type M2V[2]
Astrometry
Radial velocity (Rv)−17.30±0.09[3] km/s
Proper motion (μ) RA: 1.56[1] mas/yr
Dec.: −774.55[1] mas/yr
Parallax (π)142.0543 ± 0.0160 mas[4]
Distance22.960 ± 0.003 ly
(7.0396 ± 0.0008 pc)
Absolute magnitude (MV)9.31[5]
Details
Mass0.614[2] M☉
Radius0.705±0.023[6] R☉
Temperature3,597[2] K
Metallicity [Fe/H]−0.06[2] dex
Rotational velocity (v sin i)2.8[2] km/s
Other designations
BD+61° 2068, GJ 809, HD 199305, HIP 103096[7]
Database references
SIMBADdata
ARICNSdata

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.[5] 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.[5]

See also

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. 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.
  3. 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.
  4. 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.
  5. "Gliese 809 (HIP 103096)". Ashland Astronomy Studio. Retrieved 28 March 2014.
  6. Houdebine, E. R. (September 2010), "Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars", Monthly Notices of the Royal Astronomical Society, 407 (3): 1657–1673, Bibcode:2010MNRAS.407.1657H, doi:10.1111/j.1365-2966.2010.16827.x.
  7. "GJ 809". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-07-06.
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