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HD 177808 
Summary
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.
| 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] |
| Distance | 551 ± 8 ly (169 ± 2 pc) |
| Absolute magnitude (MV) | −0.75[2] |
| Details | |
| Radius | 42.27+1.26 −4.39[1] R☉ |
| Luminosity | 387.9±6.8[1] L☉ |
| Temperature | 3,940+233 −58[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References edit
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "HD 177808". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-10.
- ^ 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.