Astronomy:2 Boötis
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Short description: Star in the constellation Boötes
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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 |
| Distance | 337 ± 4 ly (103 ± 1 pc) |
| Absolute magnitude (MV) | 0.57[2] |
| Details[4] | |
| Mass | 1.93±0.18 M☉ |
| Radius | 10.04±0.68 R☉ |
| Luminosity | 60.3+15.6 −12.4 L☉ |
| Surface gravity (log g) | 2.77±0.07 cgs |
| Temperature | 4,867±31 K |
| Metallicity [Fe/H] | −0.05±0.03 dex |
| Rotational velocity (v sin i) | 2.21±0.45 km/s |
| Age | 1.33±0.27 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 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. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 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, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 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, doi:10.1086/130446, Bibcode: 1979PASP...91...83C.
- ↑ 4.0 4.1 4.2 Jofré, E. et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, Bibcode: 2015A&A...574A..50J.
- ↑ 5.0 5.1 "2 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2+Boo.
- ↑ 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, Bibcode: 2008MNRAS.389..869E.
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