Astronomy:Gliese 809
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cepheus[1] |
| Right ascension | 20h 53m 19.78892s[2] |
| Declination | +62° 09′ 15.8173″[2] |
| Apparent magnitude (V) | 8.54[3] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | M2V[3] |
| Astrometry | |
| Radial velocity (Rv) | −17.30±0.09[4] km/s |
| Proper motion (μ) | RA: 0.259[2] mas/yr Dec.: −773.096[2] mas/yr |
| Parallax (π) | 142.0543 ± 0.0160[2] mas |
| Distance | 22.960 ± 0.003 ly (7.0396 ± 0.0008 pc) |
| Absolute magnitude (MV) | 8.46[1] |
| Details | |
| Mass | 0.54[5] M☉ |
| Radius | 0.54[6] R☉ |
| Luminosity | 0.05[6] L☉ |
| Surface gravity (log g) | 4.72[5] cgs |
| Temperature | 3,729[6] K |
| Metallicity [Fe/H] | −0.21[5] dex |
| Rotational velocity (v sin i) | 2.8[3] km/s |
| Age | 12.3[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Gliese 809 is a red dwarf star in the constellation Cepheus. 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% the radius of the Sun and 61.4%[3] 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.
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.[8] 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.[8]
Gliese 809 forms an optical double with the 9th magnitude star BD+61°2067, but this is an unrelated background star.[9]
See also
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 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.
- ↑ 5.0 5.1 5.2 5.3 Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar (2017), "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library", The Astrophysical Journal 836 (1): 77, doi:10.3847/1538-4357/836/1/77, Bibcode: 2017ApJ...836...77Y.
- ↑ 6.0 6.1 6.2 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023), "Variability Catalog of Stars Observed during the TESS Prime Mission", The Astrophysical Journal Supplement Series 268 (1): 4, doi:10.3847/1538-4365/acdee5, Bibcode: 2023ApJS..268....4F.
- ↑ 7.0 7.1 "GJ 809". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+809.
- ↑ 8.0 8.1 Gliese 809 (HIP 103096), Ashland Astronomy Studio, http://www.astrostudio.org/xhip.php?hip=103096, retrieved 28 March 2014.
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
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