Gliese 809

Gliese 809
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 20h 53m 19.78892s[1]
Declination +62° 09′ 15.8173″[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: 0.259 mas/yr[1]
Dec.: −773.096 mas/yr[1]
Parallax (π)142.0543 ± 0.0160 mas[1]
Distance22.960 ± 0.003 ly
(7.0396 ± 0.0008 pc)
Absolute magnitude (MV)9.31[4]
Details
Mass0.614[2] M☉
Radius0.705±0.023[5] 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[6]
Database references
SIMBADdata
ARICNSdata

Gliese 809 is a red dwarf star in the constellation Cepheus.[4] 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%[5] 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]

This is a high proper motion star that moves about 0.77 arcseconds per year relative to background stars.[6] In physical terms it is travelling with a space velocity of 31.1 km/s relative to the Solar System.[4] 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.[4]

See also

References

  1. ^ a b c d 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.
  2. ^ a b c d e f g h 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. ^ a b c d "Gliese 809 (HIP 103096)". Ashland Astronomy Studio. Archived from the original on 15 April 2014. Retrieved 28 March 2014.
  5. ^ a b 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.
  6. ^ a b "GJ 809". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-07-06.

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