Astronomy:Gliese 809
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[4] mas |
| Distance | 22.960 ± 0.003 ly (7.0396 ± 0.0008 pc) |
| Absolute magnitude (MV) | 9.31[5] |
| Details | |
| Mass | 0.614[2] M☉ |
| Radius | 0.705±0.023[6] R☉ |
| Temperature | 3,597[2] K |
| Metallicity [Fe/H] | −0.06[2] dex |
| Rotational velocity (v sin i) | 2.8[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 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, doi:10.1088/0004-637X/704/2/975, Bibcode: 2009ApJ...704..975J.
- ↑ Nidever, David L. et al. (August 2002), "Radial Velocities for 889 Late-Type Stars", The Astrophysical Journal Supplement Series 141 (2): 503–522, doi:10.1086/340570, Bibcode: 2002ApJS..141..503N.
- ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 5.3 "Gliese 809 (HIP 103096)". Ashland Astronomy Studio. http://www.astrostudio.org/xhip.php?hip=103096.
- ↑ 6.0 6.1 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, doi:10.1111/j.1365-2966.2010.16827.x, Bibcode: 2010MNRAS.407.1657H.
- ↑ 7.0 7.1 "GJ 809". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+809.
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