25 Canum Venaticorum

Last updated
25 Canum Venaticorum
Observation data
Epoch J2000       Equinox J2000
Constellation Canes Venatici
Right ascension 13h 37m 27.62782s [1]
Declination +36° 17 41.6337 [1]
Apparent magnitude  (V)+4.82 [2] (4.98 + 6.95) [3]
Characteristics
Spectral type A7 III + A8 V: [4]
Astrometry
Radial velocity (Rv)−10.4±2.1 [2]  km/s
Proper motion (μ)RA: −95.54 [1]   mas/yr
Dec.: +23.75 [1]   mas/yr
Parallax (π)16.42 ± 0.53  mas [1]
Distance 199 ± 6  ly
(61 ± 2  pc)
Absolute magnitude  (MV)0.90 [2]
Orbit [5]
Period (P)228 yr
Semi-major axis (a)1.02″
Eccentricity (e)0.80
Inclination (i)147°
Longitude of the node (Ω)87°
Periastron epoch (T)1864.0
Argument of periastron (ω)
(secondary)
159°
Details
25 CVn A
Mass 2.23 [6]   M
Surface gravity (log g)3.85 [7]   cgs
Temperature 7,609±259 [7]   K
Rotational velocity (v sin i)235 [8]  km/s
Age 659 [7]   Myr
25 CVn B
Mass 1.58 [6]   M
Other designations
25 CVn, BD+37° 2433, FK5  3083, GC  18421, HD  118623, HIP  66458, HR  5127, SAO  63648, ADS  8974, CCDM 13375+3617, WDS J13375+3618 [9]
Database references
SIMBAD data

25 Canum Venaticorum is a binary star [10] system in the northern constellation of Canes Venatici, approximately 199 [1] light years from the Sun. It is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of +4.82 [2] The system is moving closer to the Earth with a heliocentric radial velocity of roughly −10 km/s. [2]

This is a wide binary system with an orbital period of 228 years and an eccentricity of 0.80. [5] As of 2001, they had a projected separation of 107.0  AU . [6] The magnitude 4.98 [3] primary, component A, has a stellar classification of A7 III, [4] which matches an A-type giant star. It is 659 [7]  million years old with a projected rotational velocity of 235 km/s. This rate of spin is giving the star an oblate shape with an equatorial bulge that is an estimated 27% larger than the polar radius. [8] The companion, component B, is a magnitude 6.95 [3] A-type main-sequence star with a class of A8 V:. [4] The ':' suffix indicates some uncertainty in the classification of this star.

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References

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