Eta Aurigae

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η Aurigae
Auriga constellation map.png
Location of η Aurigae
Observation data
Epoch J2000      Equinox J2000
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
Hoedus II, 10 Aurigae, HR 1641, HD 32630, BD+41°1058, FK5 185, HIP 23767, SAO 40026, GC 6226.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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, (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

  1. ^ (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.
  2. ^ (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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