Zeta Aurigae
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The Zeta Auriage binary system. |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Auriga |
| Right ascension | 05h 02m 28.6869s |
| Declination | +41° 04′ 33.015″ |
| Apparent magnitude (V) | 3.769 |
| Characteristics | |
| Spectral type | K4Ib-II+/B7V... |
| U−B color index | 0.87 |
| B−V color index | 1.22 |
| R−I color index | 0.87 |
| Variable type | Algol variable |
| Astrometry | |
| Radial velocity (Rv) | 12.8 km/s |
| Proper motion (μ) | RA: 8.88 mas/yr Dec.: -21.43 mas/yr |
| Parallax (π) | 4.14 ± 0.81 mas |
| Distance | approx. 800 ly (approx. 240 pc) |
| Absolute magnitude (MV) | 4.927 |
| Details | |
| Mass | 8/6 M☉ |
| Radius | 200/5 R☉ |
| Luminosity | 2100/400 L☉ |
| Temperature | 3,500–5,000/12,500 K |
| Rotation | 2.7 Year |
| Rotational velocity (v sin i) | 19 Km/s km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Zeta Aurigae (ζ Aur, ζ Aurigae) is a star in the constellation Auriga. It has the traditional names Haedus (also Hoedus) and Sadatoni (rarely Saclateri). It is one of the two hædi (kids) of the she-goat Capella, the other being Hoedus II, Eta Aurigae. The name Sadatoni is from the Arabic الساعد الثاني as-sācid aθ-θānī "the second arm (of the charioteer)". The rare traditional name Azaleh is shared (in the form Hassaleh) with Iota Aurigae[citation needed].
In Chinese, 柱 (Zhù), meaning Pillars, refers to an asterism consisting of ζ Aurigae, ε Aurigae, η Aurigae, υ Aurigae, ν Aurigae, τ Aurigae, χ Aurigae and 26 Aurigae.[1] Consequently, ζ Aurigae itself is known as 柱二 (Zhù yī, English: the Second Star of Pillars.)[2]
Zeta Aurigae is an eclipsing binary, which varies from magnitude +3.61 to +3.99 with a period of 972 days.
The main star is a red supergiant, the companion belongs to the spectral class B8. Zeta Aurigae is approximately 790 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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