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Arcturus
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Arcturus
Arcturus in the constellation of Boötes.
Observation data
Epoch J2000 Equinox J2000
Constellation
Boötes
Pronunciation
/?rk'tj??r?s/
Right ascension
14h 15m 39.7s
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
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 (p)
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 ± 0.06 M?
Radius
25.7 ± 0.3 R?
Luminosity
170 L?
Surface gravity (log g)
1.76 ± 0.05 cgs
Temperature
4,290 ± 43 K
Metallicity
-0.37 dex
Rotational velocity (v sin i)
2.4 ± 1.0 km/s
Other designations
Database references
SIMBAD
data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.),
VizieR catalog entry
Arcturus (/?rk'tj??r?s/; a Boo, a Boötis, Alpha Boötis) of the constellation Boötes is the brightest star in the northern celestial hemisphere. With a visual magnitude of -0.04, it is the fourth brightest star in the night sky, after -1.46 magnitude Sirius, -0.86 magnitude Canopus, and -0.27 magnitude Alpha Centauri. It is a relatively close star at only 36.7 light-years from Earth, and, together with Vega and Sirius, one of the most luminous stars in the Sun's neighborhood.Arcturus is a type K1.5 IIIpe orange giant star, with an absolute magnitude of -0.30. It has likely exhausted its hydrogen from its core and is currently in its active hydrogen shell burning phase. It will continue to expand before entering horizontal branch stage of its life cycle.
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