Eta Aurigae

"Haedus" redirects here. For Haedus I, see Zeta Aurigae.
η Aurigae
Location of η Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 06m 30.89337s[1]
Declination +41° 14′ 04.1127″[1]
Apparent magnitude (V) 3.18[2]
Characteristics
Spectral type B3 V[3]
U−B color index −0.66[4]
B−V color index −0.18[4]
R−I color index −0.17
Astrometry
Radial velocity (Rv)+7.3[2] km/s
Proper motion (μ) RA: +31.45[1] mas/yr
Dec.: −67.87[1] mas/yr
Parallax (π)13.40 ± 0.20 mas[1]
Distance243 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV)−1.18[5]
Details
Mass5.4 ± 0.3[6] M☉
Radius3.25 ± 0.18[7] R☉
Luminosity955[6] L☉
Surface gravity (log g)4.13 ± 0.04[7] cgs
Temperature17,201 ± 173[7] K
Rotational velocity (v sin i)95[8] km/s
Age22–55[6] Myr
Other designations
Haedus, 10 Aurigae, η Aur, BD+41°1058, FK5 185, GC 6226, HD 32630, HIP 23767, HR 1641, SAO 40026[9]
Database references
SIMBADdata

Eta Aurigae (η Aurigae, abbreviated Eta Aur, η Aur), officially named Haedus /ˈhiːdəs/,[10][11] is a star in the northern constellation of Auriga. With an apparent visual magnitude of 3.18,[2] it is visible to the naked eye. Based upon parallax measurements made during the Hipparcos mission, this star is approximately 243 light-years (75 parsecs) distant from the Sun.

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference scfs was invoked but never defined (see the help page).
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  4. ^ a b Cite error: The named reference aj76_1058 was invoked but never defined (see the help page).
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  6. ^ a b c Cite error: The named reference mnras333_1_9 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference aj129_3_1642 was invoked but never defined (see the help page).
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  10. ^ Rumrill, H. B. (June 1936). "Star Name Pronunciation". Publications of the Astronomical Society of the Pacific. 48 (283). San Francisco, California: 139. Bibcode:1936PASP...48..139R. doi:10.1086/124681. S2CID 120743052.
  11. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.