Xi Coronae Borealis

Xi Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 16h 22m 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]
Distance183 ± 3 ly
(56.2 ± 0.8 pc)
Absolute magnitude (MV)+1.04[5]
Details[4]
Mass2.36[5] M☉
Radius8 R☉
Luminosity36 L☉
Surface gravity (log g)2.9 cgs
Temperature4,853±5 K
Metallicity [Fe/H]−0.08 dex
Rotational velocity (v sin i)2.8 km/s
Age676[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
SIMBADdata

Xi Coronae Borealis (ξ CrB) is a binary star[3] system in the northern constellation of Corona 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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Hartkopf2009 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).