Zeta Coronae Borealis
Binary star in the constellation Corona Borealis / From Wikipedia, the free encyclopedia
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.
Quick Facts Apparent magnitude (V), Characteristics ...
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] |
Distance | 524 ± 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] |
Distance | 490 ± 10 ly (151 ± 4 pc) |
Orbit[6] | |
Primary | ζ2A |
Companion | ζ2 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 | |
Primary | ζ2 AB |
Companion | ζ2 C |
Period (P) | 251.5 days |
Eccentricity (e) | 0.48 |
Semi-amplitude (K1) (primary) | 28.5 km/s |
Details | |
ζ1 A | |
Mass | 3.19[7] M☉ |
Rotational velocity (v sin i) | 15[8] km/s |
ζ2 A | |
Mass | 4.13[9] M☉ |
Rotation | 1.7 days[9] |
Rotational velocity (v sin i) | 46±7[9] km/s |
ζ2 B | |
Mass | 3.73[9] M☉ |
Rotational velocity (v sin i) | 7.5±2[9] km/s |
ζ2 C | |
Mass | 3.78[9] M☉ |
Other designations | |
ζ1: HR 5833, HD 139891 | |
ζ2: HR 5834, HD 139892 | |
Database references | |
SIMBAD | ζ |
ζ1 | |
ζ2 |
Close