Arcturus

Arcturus in the constellation of Boötes.
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Pronunciation  /ɑrkˈtjʊərəs/
Right ascension 14
Declination +19° 10′ 56″
Apparent magnitude (V) −0.04
Characteristics
Spectral type K1.5IIIFe-0.5
Apparent magnitude (J) -2.25
U−B color index 1.27
B−V color index 1.23
R−I color index 0.65
Variable type Variable star
Note (category: variability): H and K emission vary.
Astrometry
Radial velocity (Rv) +5 km/s
Proper motion (μ) RA: −1093.45 mas/yr
Dec.: −1999.40 mas/yr
Parallax (π) 88.98 ± 0.68 mas
Distance 36.7 ± 0.3 ly
(11.24 ± 0.09 pc)
Absolute magnitude (MV) −0.30 ± 0.02
Details
Mass 1.10 ± 0.06M
Radius 25.7 ± 0.3R
Luminosity 170L
Surface gravity (log g) 1.76 ± 0.05
Temperature 4,290 ± 43K
Metallicity [Fe/H] −0.37dex
Rotational velocity (v sin i) 2.4 ± 1.0 km/s
Other designations
Alramech, Abramech, α Boötis, 16 Boötes, BD+19°2777, GCTP 3242.00, GJ 541, HD 124897, HIP 69673, HR 5340, LHS 48.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.),
VizieR catalog entry

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Arcturus, which is released under the Creative Commons Attribution-Share-Alike License 3.0