Astronomy:HD 177808

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Short description: Star in the constellation Lyra
HD 177808
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
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. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  3. Roman, Nancy G. (December 1955), "A Catalogue of High-Velocity Stars" (in en), The Astrophysical Journal Supplement Series 2: 195, doi:10.1086/190021, ISSN 0067-0049, Bibcode1955ApJS....2..195R. 
  4. "HD 177808". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+177808. 
  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E.