| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 16h22m 05.82391s[1] |
| Declination | +30° 53′ 31.1837″[1] |
| Apparent magnitude (V) | 4.85[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B color index | +0.80[2] |
| B−V color index | +0.97[2] |
| Astrometry | |
| Radial velocity (Rv) | −29.20±0.16[4] km/s |
| Proper motion (μ) | RA: −97.43[1] mas/yr Dec.: +107.45[1] mas/yr |
| Parallax (π) | 17.78 ± 0.25 mas[1] |
| Distance | 183 ± 3 ly (56.2 ± 0.8 pc) |
| Absolute magnitude (MV) | +1.04[5] |
| Details[4] | |
| Mass | 2.36[5] M☉ |
| Radius | 8 R☉ |
| Luminosity | 36 L☉ |
| Surface gravity (log g) | 2.9 cgs |
| Temperature | 4,853±5 K |
| Metallicity [Fe/H] | −0.08 dex |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 676[5] Myr |
| Other designations | |
ξ CrB, 19 CrB, BD+31° 2845, HD 147677, HIP 80181, HR 6103, SAO 65254, WDS J16221+3054A[6] | |
| Database references | |
| SIMBAD | data |
Xi Coronae Borealis (ξ CrB) is a binary star[3] system in the northern constellationofCorona Borealis. It is visible to the naked eye with a combined apparent visual magnitude of 4.85.[2] Based upon an annual parallax shift of 17.78 mas as seen from the Earth,[1] it is located about 183 light years from the Sun.
As of 2009, the pair had an angular separation of 91 mas along a position angle of 139.4°.[7] The brighter member, component Aa,[7] is an evolved K-type giant star with a stellar classification of K0 III.[3] It is a red clump star that is generating energy by helium fusion at its core.[8] The star has an estimated 2.36 times the mass of the Sun and has expanded to 8 times the Sun's radius. It is radiating 36 times the solar luminosity from its photosphere at an effective temperature of 4,853 K.[4]
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