Arcturus

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Arcturus
Bootes constellation map.png
Arcturus in the constellation o Boötes.
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Pronunciation /ɑːrkˈtjʊərəs/
Richt ascension 14h 15m 39.7s[1]
Declination +19° 10′ 56″[1]
Apparent magnitude (V) −0.05[1]
Chairactereestics
Spectral type K0III
Apparent magnitude (J) −2.25[1]
U−B colour index 1.27
B−V colour index 1.23
R−I colour index 0.65
Note (category: variability): H an K emission vary.
Astrometry
Radial velocity (Rv)−5 km/s
Proper motion (μ) RA: −1093.45[2] mas/yr
Dec.: −1999.40[2] mas/yr
Parallax (π)88.83 ± 0.54[3] mas
Distance36.7 ± 0.2 ly
(11.26 ± 0.07 pc)
Absolute magnitude (MV)−0.30±0.02[4]
Details
Mass1.08±0.06[5] M
Radius25.4±0.2[5] R
Luminosity170[6] L
Surface gravity (log g)1.66±0.05[5] cgs
Temperatur4286±30[5] K
Metallicity [Fe/H]−0.52±0.04[5] dex
Rotational velocity (v sin i)2.4±1.0[4] km/s
Age7.1+1.5
−1.2
[5] Gyr
Ither designations
Alramech, Abramech, α Boötis, 16 Boötes, BD+19°2777, GCTP 3242.00, GJ 541, HD 124897, HIP 69673, HR 5340, LHS 48, SAO 100944.
Database references
SIMBADdata
Data soorces:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5t rev. ed.),
VizieR catalog entry

Arcturus (/ɑːrkˈtjʊərəs/; α Boo, α Boötis, Alpha Boötis) o the constellation Boötes is the brichtest starn in the northren celestial hemisphere.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 "Arcturus (HD 124897)". SIMBAD Astronomical Database. Retrieved 2011-11-27. 
  2. 2.0 2.1 Perryman; et al. (1997). "HIP 69673". The Hipparcos and Tycho Catalogues. 
  3. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  4. 4.0 4.1 Carney, Bruce W.; et al. (Mairch 2008). "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars". The Astronomical Journal. 135 (3): 892–906. arXiv:0711.4984Freely accessible. Bibcode:2008AJ....135..892C. doi:10.1088/0004-6256/135/3/892{{inconsistent citations}} 
  5. 5.0 5.1 5.2 5.3 5.4 5.5 I. Ramírez; C. Allende Prieto (December 2011). "Fundamental Parameters and Chemical Composition of Arcturus". The Astrophysical Journal. 743 (2): 135. arXiv:1109.4425Freely accessible. Bibcode:2011ApJ...743..135R. doi:10.1088/0004-637X/743/2/135. 
  6. Schröder, K.-P.; Cuntz, M. (Aprile 2007). "A critical test of empirical mass loss formulas applied to individual giants and supergiants". Astronomy and Astrophysics. 465 (2): 593–601. arXiv:astro-ph/0702172Freely accessible. Bibcode:2007A&A...465..593S. doi:10.1051/0004-6361:20066633{{inconsistent citations}}