HD 189831
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 20h 03m 33.45912s[1] |
| Declination | −37° 56′ 26.5236″[1] |
| Apparent magnitude (V) | 4.77[2] |
| Characteristics | |
| Spectral type | K5III[3] |
| U−B color index | +1.68[4] |
| B−V color index | +1.41[4] |
| Astrometry | |
| Radial velocity (Rv) | -38.30[5] km/s |
| Proper motion (μ) | RA: +64.47[1] mas/yr Dec.: -86.43[1] mas/yr |
| Parallax (π) | 8.90 ± 0.29 mas[1] |
| Distance | 370 ± 10 ly (112 ± 4 pc) |
| Absolute magnitude (MV) | -0.48[2] |
| Details | |
| Luminosity | 316[2] L☉ |
| Temperature | 4,099[6] K |
| Rotational velocity (v sin i) | < 1.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 189831 is a class K5III[3] (orange giant) star in the constellation Sagittarius. Its apparent magnitude is 4.77[2] and it is approximately 366 light years away based on parallax.[1]
References
[edit]- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ 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. Vizier catalog entry
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
- ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. S2CID 119258214.
- ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID 54046583. Vizier catalog entry
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