Cor Caroli
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Canes Venatici |
| α2 CVn | |
| Right ascension | 12h 56m 01.66622s |
| Declination | +38° 19′ 06.1541″ |
| Apparent magnitude (V) | 2.84 to 2.98 |
| α1 CVn | |
| Right ascension | 12h 56m 00.43258s |
| Declination | +38° 18′ 53.3768″ |
| Apparent magnitude (V) | 5.60 |
| Characteristics | |
| α2 CVn | |
| Spectral type | A0pSiEuHg |
| U−B color index | −0.32 |
| B−V color index | −0.12 |
| Variable type | α2 CVn |
| α1 CVn | |
| Spectral type | F2V |
| U−B color index | −0.03 |
| B−V color index | +0.34 |
| Astrometry | |
| α2 CVn | |
| Radial velocity (Rv) | −4.1±0.2 km/s |
| Proper motion (μ) | RA: −235.08 mas/yr Dec.: 53.54 mas/yr |
| Parallax (π) | 32.7227±0.5844 mas |
| Distance | 100 ± 2 ly (30.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.16±0.08 |
| α1 CVn | |
| Radial velocity (Rv) | −0.60 ± 0.9 km/s |
| Proper motion (μ) | RA: −232.86 mas/yr Dec.: 55.69 mas/yr |
| Parallax (π) | 30.6121 ± 0.0666 mas |
| Distance | 106.5 ± 0.2 ly (32.67 ± 0.07 pc) |
| Details | |
| α2 CVn | |
| Mass | 2.97±0.07 M☉ |
| Radius | 2.49±0.26 R☉ |
| Luminosity | 101±12 L☉ |
| Surface gravity (log g) | 3.9±0.1 cgs |
| Temperature | 11,600±500 K |
| Rotation | 5.46939 d |
| Rotational velocity (v sin i) | 18.4±0.5 km/s |
| Age | 165+60 −70 Myr |
| α1 CVn | |
| Mass | 1.47±0.15 M☉ |
| Radius | 1.5 R☉ |
| Surface gravity (log g) | 4.25±0.22 cgs |
| Temperature | 7,080 K |
| Rotational velocity (v sin i) | 18 km/s |
| Other designations | |
| α CVn, Alpha CVn, 12 CVn, BD+39°2580, ADS 8706 AB, CCDM J12560+3819B | |
| α2 CVn: α CVn A, 12 CVn A, FK5 485, GC 17557, HD 112413, HIP 63125, HR 4915, SAO 63257 | |
| α1 CVn: α CVn B, 12 CVn B, GC 17556, HD 112412, HIP 63121, HR 4914, SAO 63256 | |
| Database references | |
| SIMBAD | α2 CVn |
| α1 CVn | |
Cor Caroli /ˌkɔːr ˈkærəlaɪ/ is a binary star in the northern constellation of Canes Venatici. It is the brightest star in the constellation, lying at the third magnitude. The International Astronomical Union uses the name "Cor Caroli" specifically for the brighter star of the binary. The system has the Bayer designation Alpha Canum Venaticorum or α Canum Venaticorum.