Gliese 809

From the Science Archives, the open-project database of science information
Jump to navigation Jump to search
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)141.87 ± 0.64[1] mas
Distance23.0 ± 0.1 ly
(7.05 ± 0.03 pc)
Absolute magnitude (MV)9.31[4]
Details
Mass0.614[2] M
Radius0.705±0.023[5] R
Diameter0.705±0.023[5] D
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] 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%[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[edit]

References[edit]

  1. 1.0 1.1 1.2 1.3 1.4 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.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
  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.
  4. 4.0 4.1 4.2 4.3 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  5. 5.0 5.1 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. 6.0 6.1 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).


Add your comment
The Science Archives welcomes all comments. If you do not want to be anonymous, register or log in. It is free.


As a reminder, article comments are only for discussions on how to improve the article. Please direct other comments to a user's talk page. Please be formal and do not use excessive uppercase. Please be advised you may receive an automatic block if you break the article comments policy. For information regarding what is acceptable/not acceptable in article comments, please message Icons-flag-ru.png Joey (talk), Natalia (talk), Icons-flag-fr.png ynoss (talk), or Icons-flag-ca.png Daniel (older account/talk).