2 Boötis

2 Boötis is a single[6] star in the northern constellation of Boötes,[5] located 337 light years away from the Sun.[1] It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 5.63.[2] This object is moving further from the Earth with a heliocentric radial velocity of +4 km/s.[1]

2 Boötis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Bootes
Right ascension  13h 41m 02.34661s[1]
Declination +22° 29′ 44.7744″[1]
Apparent magnitude (V) 5.63[2]
Characteristics
Spectral type K0 III[3]
B−V color index 1.009[2]
Astrometry
Radial velocity (Rv)+4.00±0.16[1] km/s
Proper motion (μ) RA: −17.353[1] mas/yr
Dec.: −25.324[1] mas/yr
Parallax (π)9.6708 ± 0.1033[1] mas
Distance337 ± 4 ly
(103 ± 1 pc)
Absolute magnitude (MV)0.57[2]
Details[4]
Mass1.93±0.18 M☉
Radius10.04±0.68 R☉
Luminosity60.3+15.6
−12.4 L☉
Surface gravity (log g)2.77±0.07 cgs
Temperature4,867±31 K
Metallicity [Fe/H]−0.05±0.03 dex
Rotational velocity (v sin i)2.21±0.45 km/s
Age1.33±0.27 Gyr
Other designations
2 Boo, BD+23°2600, HD 119126, HIP 66763, HR 5149, SAO 82946[5]
Database references
SIMBADdata

At the age of 1.33 billion years old,[4] this is an evolved giant star with a stellar classification of K0 III,[3] having exhausted the hydrogen at its core and expanded off the main sequence. It has 1.9 times the mass of the Sun with ten times the Sun's radius. The star is radiating 60 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,867 K.[4]

References
  1. 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. 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.
  3. Cowley, A. P.; Bidelman, W. P. (February 1979), "MK spectral types for some F and G stars", Publications of the Astronomical Society of the Pacific, 91: 83–86, Bibcode:1979PASP...91...83C, doi:10.1086/130446.
  4. Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474.
  5. "2 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-06.
  6. 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.
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