Eta Aurigae
 Location of η Aurigae |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Auriga |
| Right ascension | 05h 06m 30.8928s |
| Declination | +41° 14′ 04.108″ |
| Apparent magnitude (V) | 3.158 |
| Characteristics | |
| Spectral type | B3V |
| U−B color index | -0.67 |
| B−V color index | -0.18 |
| R−I color index | -0.17 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | 7.3 km/s |
| Proper motion (μ) | RA: 30.6 mas/yr Dec.: -68.41 mas/yr |
| Parallax (π) | 14.87 ± 0.74 mas |
| Distance | 220 ± 10 ly (67 ± 3 pc) |
| Absolute magnitude (MV) | 3.012 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Rotation | 132 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Eta Aurigae (η Aur, η Aurigae) is a star in the constellation Auriga. Along with ζ Aurigae it represents one of the Kids of the she-goat Capella, from which it gets its Latin traditional name Hoedus II or Haedus II, from the Latin hædus "kid"; Zeta Aurigae is Hoedus I. It has the less common traditional name Mahasim, from the Arabic المِعْصَم al-micşam "wrist" (of the charioteer), which it shares with Theta Aurigae.
In Chinese, 柱 (Zhù), meaning Pillars, refers to an asterism consisting of η Aurigae, ε Aurigae, ζ Aurigae , υ Aurigae, ν Aurigae, τ Aurigae, χ Aurigae and 26 Aurigae.[1] Consequently, η Aurigae itself is known as 柱三 (Zhǔ sān, English: the Third Star of Pillars.)[2]
Eta Aurigae is a blue-white B-type main sequence dwarf with an apparent magnitude of +3.18. It is approximately 219 light-years from Earth.
[edit] References
- ^ (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.
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