Omega Herculis

Omega Herculis

Historical view of the Hercules constellation showing the star Kajam (ω Her) as "the club" in the hero's right hand.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hercules
Right ascension 16h 25m 24.95425s[1]
Declination +14° 01′ 59.7711″[1]
Apparent magnitude (V) 4.5821[1] (4.58 + 11.5)[2]
Characteristics
Spectral type A2 Vp CrSr[3]
U−B color index +0.01[4]
B−V color index +0.00[4]
Variable type α2 CVn[5]
Astrometry
Radial velocity (Rv)−5.90±0.74[6] km/s
Proper motion (μ) RA: +40.86[1] mas/yr
Dec.: −59.71[1] mas/yr
Parallax (π)13.04 ± 0.64 mas[1]
Distance250 ± 10 ly
(77 ± 4 pc)
Absolute magnitude (MV)0.29±0.15[7]
Details
ω Her A
Mass2.14[8] M☉
Radius3.30[9] R☉
Luminosity70[10] L☉
Surface gravity (log g)3.51±0.35[11] cgs
Temperature10,052±320[11] K
Metallicity [Fe/H]+0.47±0.15[11] dex
Rotation2.951[12] d
Rotational velocity (v sin i)55[13] km/s
Age149[8] Myr
Other designations
Cujam, ω Her, 24 Her, 51 Ser, BD+14°3049, FK5 613, HD 148112, HIP 80463, HR 6117, SAO 102153, WDS J16254+1402AB.[14]
Database references
SIMBADdata

Omega Herculis (ω Herculis, abbreviated Ome Her, ω Her) is a binary star[2] system in the northern constellation of Hercules. Based upon an annual parallax shift of 13.04 mas as seen from Earth, it is located around 250 light-years from the Sun. It is faintly visible to the naked eye, having a combined apparent visual magnitude of 4.58.[1] The system is a candidate for membership in the Ursa Major Moving Group, although this remains uncertain.[7]

The two components are designated Omega Herculis A (officially named Cujam /ˈkjuːdʒəm/, the traditional name of the system)[15] and B.

  1. ^ a b c d e f g Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Dubath2011 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference King2003 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Shulyak2014 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Aslanov1987 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).