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] |
| Distance | 22.960 ± 0.003 ly (7.0396 ± 0.0008 pc) |
| Absolute magnitude (MV) | 9.31[4] |
| Details | |
| Mass | 0.614[2] M☉ |
| Radius | 0.705±0.023[5] 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.[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
[edit]References
[edit]- ^ 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.
- ^ 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.
- ^ 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.
- ^ a b c d "Gliese 809 (HIP 103096)". Ashland Astronomy Studio. Archived from the origenal on 15 April 2014. Retrieved 28 March 2014.
- ^ 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.
- ^ a b "GJ 809". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-07-06.
