Gamma Coronae Borealis

γ Coronae Borealis
Location of γ Coronae Borealis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Borealis
Right ascension 15h 42m 44.56551s[1]
Declination +26° 17′ 44.2847″[1]
Apparent magnitude (V) 3.80 – 3.86[2] (4.04 + 5.60)[3]
Characteristics
Spectral type B9 V + A3 V[4]
U−B color index −0.03[5]
B−V color index +0.00[5]
Variable type δ Sct[2]
Astrometry
Radial velocity (Rv)−15.26±4.54[6] km/s
Proper motion (μ) RA: −111.65[1] mas/yr
Dec.: +49.52[1] mas/yr
Parallax (π)22.33 ± 0.50 mas[1]
Distance146 ± 3 ly
(45 ± 1 pc)
Absolute magnitude (MV)+0.56[7]
Orbit[8]
Period (P)91.2±0.4 yr
Semi-major axis (a)0.729±0.006″
Eccentricity (e)0.48±0.01
Inclination (i)94.45±0.07°
Longitude of the node (Ω)111.75±0.09°
Periastron epoch (T)1931.6±0.3
Argument of periastron (ω)
(secondary)		103.8±0.6°
Details
γ CrB A
Mass2.51±0.04[9] M☉
Luminosity59[9] L☉
Temperature7,649±22[10] K
Rotational velocity (v sin i)182±12[6] km/s
Age400[11] Myr
Other designations
γ CrB, 8 CrB, BD+26°2722, HD 140436, HIP 76952, HR 5849, SAO 83958, ADS 9757, WDS J15427+2618[12]
Database references
SIMBADdata

Gamma Coronae Borealis, Latinized from γ Coronae Borealis, is a binary star system in the northern constellation of Corona Borealis. It is visible to the naked eye with an apparent visual magnitude of 3.83.[5] Based upon an annual parallax shift of 22.33[1] mas as seen from Earth, it is located about 146 light years from the Sun. The system is moving closer to the Sun with a radial velocity of about −15 km/s.[6]

  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 Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Cvetkovic2010 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Fernie1969 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Becker2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Hartkopf2006 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Bermejo2013 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Vican2012 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).