19 Canum Venaticorum
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 13h 15m 31.95263s |
| Declination | +40° 51′ 18.7516″ |
| Apparent magnitude (V) | 5.77 (5.87 + 9.48) |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A7 V |
| B−V color index | 0.198±0.004 |
| Astrometry | |
| Radial velocity (Rv) | −21.1±2.6 km/s |
| Proper motion (μ) | RA: −113.761 mas/yr Dec.: +19.858 mas/yr |
| Parallax (π) | 13.7210±0.1581 mas |
| Distance | 238 ± 3 ly (72.9 ± 0.8 pc) |
| Absolute magnitude (MV) | 1.42 |
| Orbit | |
| Period (P) | 219.2 yr |
| Semi-major axis (a) | 0.745″ |
| Eccentricity (e) | 0.686 |
| Inclination (i) | 44.5° |
| Longitude of the node (Ω) | 22.2° |
| Periastron epoch (T) | 2201.7 |
| Argument of periastron (ω) (secondary) | 273.3° |
| Details | |
| 19 CVn A | |
| Mass | 2.06±0.03 M☉ |
| Radius | 2.5 R☉ |
| Luminosity | 25.5+1.9 −1.8 L☉ |
| Surface gravity (log g) | 4.09±0.14 cgs |
| Temperature | 8,048±274 K |
| Rotational velocity (v sin i) | 110 km/s |
| Age | 366 Myr |
| Other designations | |
| 19 CVn, BD+41°2374, FK5 461, HD 115271, HIP 64692, HR 5004, SAO 44531, WDS J13155+4051 | |
| Database references | |
| SIMBAD | data |
19 Canum Venaticorum is a binary star system in the northern constellation of Canes Venatici, located approximately 238 light years from Sun based on its parallax. It is dimly visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.77. The pair orbit each other with a period of 219.2 years and an eccentricity of 0.686. The system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.
The magnitude +5.87 primary, component A, is an A-type main-sequence star with a stellar classification of A7 V. It is 366 million years old with twice the mass of the Sun and 2.5 times the Sun's radius. The star is radiating 25.5 times the Sun's luminosity from its photosphere at an effective temperature of 8,048 K. It has a high rate of spin, showing a projected rotational velocity of 110 km/s. As of 2012, its companion, designated component B, is a magnitude 9.48 star located 0.60 arcseconds from the primary along a position angle of 58°.