HD 189831

HD 189831

Observation data Epoch J2000      Equinox J2000
Constellation	Sagittarius
Right ascension	20^h 03^m 33.45912^s[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
CD-38°13828, FK5 3602, GC 27779, GSC 07947-03890, HIP 98761, HR 7652, HD 189831, SAO 211767
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

1. 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
2. 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
3. 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.
4. 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
5. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
6. 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.
7. 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