Zeta Coronae Borealis

ζ Coronae Borealis
Location of ζ Coronae Borealis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
ζ1
Right ascension 15h 39m 22.247s[1]
Declination +36° 38′ 12.42″[1]
Apparent magnitude (V) 5.95[2]
ζ2
Right ascension 15h 39m 22.668s[1]
Declination +36° 38′ 08.78″[1]
Apparent magnitude (V) 4.99[2]
Characteristics
ζ1
Evolutionary stage Main sequence
Spectral type B9 V[2]
ζ2
Evolutionary stage Main sequence
Spectral type B6 V + B7 V[2]
Astrometry
ζ1
Radial velocity (Rv)−19.4[3] km/s
Proper motion (μ) RA: −14.199±0.093[4] mas/yr
Dec.: −3.871±0.128[4] mas/yr
Parallax (π)6.2190 ± 0.0685 mas[4]
Distance524 ± 6 ly
(161 ± 2 pc)
ζ2
Radial velocity (Rv)−24.3[3] km/s
Proper motion (μ) RA: −15.624±0.273[5] mas/yr
Dec.: −7.310±0.342[5] mas/yr
Parallax (π)6.6433 ± 0.1841 mas[5]
Distance490 ± 10 ly
(151 ± 4 pc)
Orbit[6]
Primaryζ2A
Companionζ2 B
Period (P)1.72357 days
Eccentricity (e)0.013
Inclination (i)38°
Semi-amplitude (K1)
(primary)		109.6 km/s
Semi-amplitude (K2)
(secondary)		121.2 km/s
Orbit
Primaryζ2 AB
Companionζ2 C
Period (P)251.5 days
Eccentricity (e)0.48
Semi-amplitude (K1)
(primary)		28.5 km/s
Details
ζ1 A
Mass3.19[7] M☉
Rotational velocity (v sin i)15[8] km/s
ζ2 A
Mass4.13[9] M☉
Rotation1.7 days[9]
Rotational velocity (v sin i)46±7[9] km/s
ζ2 B
Mass3.73[9] M☉
Rotational velocity (v sin i)7.5±2[9] km/s
ζ2 C
Mass3.78[9] M☉
Other designations
7 Coronae Borealis, HIP 76669, BD+37°2665, CCDM J15394+3638, WDS J15394+3638
ζ1: HR 5833, HD 139891
ζ2: HR 5834, HD 139892
Database references
SIMBADζ
ζ1
ζ2

ζ Coronae Borealis, Latinised as Zeta Coronae Borealis, is the Bayer designation of a double star in the constellation Corona Borealis. The two components are separated by six arc-seconds and share the same Hipparcos catalogue number and Flamsteed designation. Each of the two is also a spectroscopic multiple system, with a total of five stars in the group.

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