Epsilon Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 00m 17.3738s[1] |
| Declination | 30° 55′ 35.057″[1] |
| Apparent magnitude (V) | 3.9111[2] |
| Characteristics | |
| Spectral type | A0 V[1] |
| U−B color index | -0.12 |
| B−V color index | -0.03 |
| Astrometry | |
| Radial velocity (Rv) | -25.1[1] km/s |
| Proper motion (μ) | RA: -47.68[1] mas/yr Dec.: 26.89[1] mas/yr |
| Parallax (π) | 21.04 ± 0.14[2] mas |
| Distance | 155 ± 1 ly (47.5 ± 0.3 pc) |
| Absolute magnitude (MV) | 0.53 |
| Details | |
| Mass | 2.6±0.1[3] M☉ |
| Radius | 2.72±0.07[4] R☉ |
| Surface gravity (log g) | 3.98±0.02[4] cgs |
| Temperature | 10197±57[4] K |
| Age | 400+50 −40[3] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Herculis (ε Her, ε Herculis) is a fourth-magnitude spectroscopic binary star in the constellation Hercules. It has the traditional name Cujam.
In Chinese, 天紀 (Tiān Jì), meaning Celestial Discipline, refers to an asterism consisting of ε Herculis, ξ Coronae Borealis, ζ Herculis, 59 Herculis, 61 Herculis, 68 Herculis, HD 160054 and θ Herculis.[5] Consequently, ε Herculis itself is known as 天紀三 (Tiān Jì sān, English: the Third Star of Celestial Discipline.)[6]
See also
References
- 1 2 3 4 5 6 "SIMBAD query result:eps Her -- Spectroscopic binary". Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-28.
- 1 2 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 2010-09-28
- 1 2 Janson, Markus; et al. (August 2011), "High-contrast Imaging Search for Planets and Brown Dwarfs around the Most Massive Stars in the Solar Neighborhood", The Astrophysical Journal 736 (2): 89, arXiv:1105.2577, Bibcode:2011ApJ...736...89J, doi:10.1088/0004-637X/736/2/89
- 1 2 3 Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855
- ↑ (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) AEEA (Activities of Exhibition and Education in Astronomy) 26 June 2006 天文教育資訊網 2006 年 6 月 26 日
External links
- Jim Kaler's Stars, University of Illinois: EPS HER (Epsilon Herculis)
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Coordinates: 
17h 00m 17.3738s, +30° 55′ 35.06″
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