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Cor Caroli

α Canum Venaticorum
The location of α Canum Venaticorum (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canes Venatici
α2 CVn
Right ascension 12h 56m 01.66622s[1]
Declination +38° 19′ 06.1541″[1]
Apparent magnitude (V) 2.84 to 2.98[2]
α1 CVn
Right ascension 12h 56m 00.43258s[1]
Declination +38° 18′ 53.3768″[1]
Apparent magnitude (V) 5.60[3]
Characteristics
α2 CVn
Spectral type A0pSiEuHg[4]
U−B color index −0.32[5]
B−V color index −0.12[5]
Variable type α2 CVn
α1 CVn
Spectral type F2V[6]
U−B color index −0.03[7]
B−V color index +0.34[7]
Astrometry
α2 CVn
Radial velocity (Rv)−4.1±0.2[8] km/s
Proper motion (μ) RA: −235.08[1] mas/yr
Dec.: 53.54[1] mas/yr
Parallax (π)32.7227 ± 0.5844 mas[9]
Distance100 ± 2 ly
(30.6 ± 0.5 pc)
Absolute magnitude (MV)0.16±0.08[10]
α1 CVn
Radial velocity (Rv)−0.60 ± 0.9[11] km/s
Proper motion (μ) RA: −232.86[1] mas/yr
Dec.: 55.69[1] mas/yr
Parallax (π)30.6121 ± 0.0666 mas[12]
Distance106.5 ± 0.2 ly
(32.67 ± 0.07 pc)
Details
α2 CVn
Mass2.97±0.07[10] M☉
Radius2.49±0.26[10] R☉
Luminosity101±12[10] L☉
Surface gravity (log g)3.9±0.1[10] cgs
Temperature11,600±500[10] K
Rotation5.46939 d[10]
Rotational velocity (v sin i)18.4±0.5[10] km/s
Age165+60
−70[10] Myr
α1 CVn
Mass1.47±0.15[13] M☉
Radius1.5[13] R☉
Surface gravity (log g)4.25±0.22[13] cgs
Temperature7,080[13] K
Rotational velocity (v sin i)18[14] km/s
Other designations
α CVn, Alpha CVn, 12 CVn, BD+39° 2580, ADS 8706 AB, CCDM J12560+3819B[15]
α2 CVn: α CVn A, 12 CVn A, FK5 485, GC 17557, HD 112413, HIP 63125, HR 4915, SAO 63257[15]
α1 CVn: α CVn B, 12 CVn B, GC 17556, HD 112412, HIP 63121, HR 4914, SAO 63256[16]
Database references
SIMBADα2 CVn
α1 CVn

Cor Caroli /ˌkɔːr ˈkærəlaɪ/ is a binary star designated Alpha Canum Venaticorum or α Canum Venaticorum. The International Astronomical Union uses the name "Cor Caroli" specifically for the brighter star of the binary.[17] Alpha Canum Venaticorum is the brightest point of light in the northern constellation of Canes Venatici.

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