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] |
Distance | 250 ± 10 ly (77 ± 4 pc) |
Absolute magnitude (MV) | 0.29±0.15[7] |
Details | |
ω Her A | |
Mass | 2.14[8] M☉ |
Radius | 3.30[9] R☉ |
Luminosity | 70[10] L☉ |
Surface gravity (log g) | 3.51±0.35[11] cgs |
Temperature | 10,052±320[11] K |
Metallicity [Fe/H] | +0.47±0.15[11] dex |
Rotation | 2.951[12] d |
Rotational velocity (v sin i) | 55[13] km/s |
Age | 149[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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.
vanLeeuwen2007
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