19 Canum Venaticorum

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 mas[1]
Distance238 ± 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
Mass2.06±0.03[4] M☉
Radius2.5[8] R☉
Luminosity25.5+1.9
−1.8[4] L☉
Surface gravity (log g)4.09±0.14[9] cgs
Temperature8,048±274[9] K
Rotational velocity (v sin i)110[4] km/s
Age366[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
SIMBADdata

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]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference wds was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Appenzeller1967 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference IAU2015 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference AllendePrieto1999 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).