Omega Herculis
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 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 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 25m 24.9533s[1] |
| Declination | 14° 01′ 59.770″[1] |
| Apparent magnitude (V) | 4.5821[2] |
| Characteristics | |
| Spectral type | B9p Cr[2] |
| U−B color index | 0.01[3] |
| B−V color index | +0.00[3] |
| Astrometry | |
| Radial velocity (Rv) | -5.9[1] km/s |
| Proper motion (μ) | RA: 39.39[1] mas/yr Dec.: -59.89[1] mas/yr |
| Parallax (π) | 13.87 ± 0.94[4] mas |
| Distance | 240 ± 20 ly (72 ± 5 pc) |
| Absolute magnitude (MV) | 0.29 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Coordinates: 
16h 25m 24.953s, +14° 01′ 59.77″
Omega Herculis (ω Her, ω Herculis) is a star in the constellation Hercules. It has the traditional name Kajam ("club") (also written as Cajam, Cujam).[5]
In Chinese, 斗 (Dǒu), meaning Dipper for Liquid, refers to an asterism consisting of ω Herculis, 49 Serpentis, 13 Herculis, 29 Herculis and 33 Herculis.[6] Consequently, ω Herculis itself is known as 斗一 (Dǒu yī, English: the First Star of Dipper for Liquid.)[7]
Omega Herculis was a latter designation of 51 Serpentis.[8]
Structure
Omega Herculis belongs to spectral class B9pCr and has apparent magnitude +4.58. It is approximately 240 light years from Earth.
See also
- Lists of stars in the constellation Hercules
- Class B Stars
- Variable star
- Double star
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "SIMBAD query result:V* ome Her -- Variable Star of alpha2 CVn type". Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-26.
- ↑ 2.0 2.1 van Leeuwen, F (November 2007). "Hipparcos, the New Reduction". Astronomy and Astrophysics (Centre de Données astronomiques de Strasbourg) 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Retrieved 2010-09-26. More than one of
|work=and|journal=specified (help) - ↑ 3.0 3.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. (PDF). Bibcode:1986EgUBV........0M. Unknown parameter
|origin=ignored (help) - ↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E. et al (1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics (PDF) 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ↑ Kurt Vonnegut. "Constellations: Hercules 'the Strongman'". The BBC (British Broadcasting Corporation). Retrieved 2010-11-14.
- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987 18: 221. Bibcode:1987JHA....18..209W.
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