HD 177808

HD 177808
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 04m 57.87462s[1]
Declination +31° 44′ 38.6538″[1]
Apparent magnitude (V) 5.63[2]
Characteristics
Spectral type M0III[3]
B−V color index 1.548±0.003[2]
Astrometry
Radial velocity (Rv)3.47±0.14[2] km/s
Proper motion (μ) RA: +74.989[1] mas/yr
Dec.: −76.884[1] mas/yr
Parallax (π)5.9150 ± 0.0831 mas[1]
Distance551 ± 8 ly
(169 ± 2 pc)
Absolute magnitude (MV)−0.75[2]
Details
Radius42.27+1.26
−4.39[1] R☉
Luminosity387.9±6.8[1] L☉
Temperature3,940+233
−58[1] K
Other designations
BD+31°3453, GC 26266, HD 177808, HIP 93718, HR 7237, SAO 67782[4]
Database references
SIMBADdata

HD 177808 is a 6th magnitude star in the constellation Lyra, approximately 610 light years away from Earth. It is a solitary[5] red giant star of the spectral type M0III, meaning it possesses a surface temperature of around 3,940 kelvins. It is therefore much larger and brighter than the Sun, yet cooler in comparison.

References

  1. ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. ^ Roman, Nancy G. (December 1955), "A Catalogue of High-Velocity Stars", The Astrophysical Journal Supplement Series, 2: 195, Bibcode:1955ApJS....2..195R, doi:10.1086/190021, ISSN 0067-0049.
  4. ^ "HD 177808". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-10.
  5. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.


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