Epsilon Boötis A/B

Location of ε Boötes (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14
Declination +27° 04′ 27.2099″
Apparent magnitude (V) 2.37
Characteristics
Spectral type K0 II-III
U−B color index +0.73
B−V color index +0.97
Astrometry
Radial velocity (Rv) -16.31 km/s
Proper motion (μ) RA: -50.95 mas/yr
Parallax (π) 16.10 ± 0.66mas
Distance 203 ± 8 ly
(62 ± 3 pc)
Details
A
Mass 4.6M
Radius 33R
Luminosity 501L
Surface gravity (log g) 2.2
Temperature 4,550K
Metallicity –0.13
Rotational velocity (v sin i) 10.9 km/s
Age 37.4 ± 4.2Myr
B
Rotational velocity (v sin i) 123 km/s
Other designations
Eps Boo, Izar, Pulcherrima, Mirac, Mirak, Mirach, 36 Boo, BD +27 2417, HIP 72105

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