19 Canum Venaticorum

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19 Canum Venaticorum
Observation data
Epoch J2000       Equinox J2000
Constellation Canes Venatici
Right ascension  13h 15m 31.95263s [1]
Declination +40° 51 18.7516 [1]
Apparent magnitude  (V)5.77 [2] (5.87 + 9.48) [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type A7 V [5]
B−V color index 0.198±0.004 [2]
Astrometry
Radial velocity (Rv)−21.1±2.6 [6]  km/s
Proper motion (μ)RA: −113.761 [1]   mas/yr
Dec.: +19.858 [1]   mas/yr
Parallax (π)13.7210 ± 0.1581 [1]   mas
Distance 238 ± 3  ly
(72.9 ± 0.8  pc)
Absolute magnitude  (MV)1.42 [2]
Orbit [7]
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 [4]   M
Radius 2.5 [8]   R
Luminosity 25.5+1.9
−1.8
[4]   L
Surface gravity (log g)4.09±0.14 [9]   cgs
Temperature 8,048±274 [9]   K
Rotational velocity (v sin i)110 [4]  km/s
Age 366 [9]   Myr
Other designations
19 CVn, BD+41° 2374, FK5  461, HD  115271, HIP  64692, HR  5004, SAO  44531, WDS J13155+4051 [10]
Database references
SIMBAD data

19 Canum Venaticorum is a binary star [7] 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. [2] The pair orbit each other with a period of 219.2 years and an eccentricity of 0.686. [7] The system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s. [6]

The magnitude +5.87 primary, component A, is an A-type main-sequence star with a stellar classification of A7 V. [3] It is 366 [9]  million years old with twice [4] the mass of the Sun and 2.5 [8] times the Sun's radius. The star is radiating 25.5 [4] times the Sun's luminosity from its photosphere at an effective temperature of 8,048 K. [9] It has a high rate of spin, showing a projected rotational velocity of 110 km/s. [4] 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°. [3]

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53 Virginis is a single, yellow-white hued star in the zodiac constellation of Virgo. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.04. Based upon an annual parallax shift of 29.49±0.29 mas, it is located 111 light years away. The star is moving closer to the Sun with a heliocentric radial velocity of −12.7 km/s. It has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 284±18 mas/yr along a position angle of 162.2°.

References

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