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]
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^Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
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Gliese809 is a red dwarf star in the constellation Cepheus, forming the primary component of a multi-star system. A visual magnitude of 8.55 makes it...
artifacts of stellar activity. These include Gliese 581 d & g, Gliese 667 Ce & f, Gliese 682 b & c, Kapteyn b, and Gliese 832 c. HD 85512 b was initially estimated...
active K2 dwarf Epsilon Eridani", The Astrophysical Journal, 412 (2): 797–809, Bibcode:1993ApJ...412..797D, doi:10.1086/172962. Rocha-Pinto, H. J.; et al...
1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. Gliese Catalogue of Nearby Stars, preliminary 3rd ed., 1991. CDS ID V/70A. Vallenari...
(b, c and d). The nearest system with four or more confirmed planets is Gliese 876, with four known.[citation needed] The farthest confirmed multiplanetary...
neighbor, Gliese 581 d, may be a more likely candidate for habitability. In September 2010, the discovery was announced of another planet, Gliese 581 g,...
southern celestial hemisphere. Its first discovery was a planet orbiting Gliese 86. Other observing programmes focus on variable stars, asteroseismology...
9.4 times the mass of Jupiter); the least massive confirmed planet is Gliese 581 e, which masses 0.007906 MJ or 2.51 M🜨. The longest period of any confirmed...
P. cyrtanthoides, is commonly known as añañuca in Chile, and the star Gliese 367 is named after it. The genus was described by John Lindley in 1825....
Lyrae", Monthly Notices of the Royal Astronomical Society, 432 (1): 799–809, arXiv:1303.5812, Bibcode:2013MNRAS.432..799M, doi:10.1093/mnras/stt515,...
Gregory W.; Laughlin, Gregory (2014). "The Lick–Carnegie exoplanet survey: Gliese 687 b: A Neptune-mass planet orbiting a nearby red dwarf". The Astrophysical...
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