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.

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

References

edit
  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.