Omega Aurigae

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Omega Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 04h 59m 15.41038s[1]
Declination +37° 53′ 24.8854″[1]
Apparent magnitude (V) 4.95[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A1 V[4]
U−B color index +0.01[2]
B−V color index +0.05[2]
R−I color index 0.03
Astrometry
Radial velocity (Rv)+5[5] km/s
Proper motion (μ) RA: +44.531[1] mas/yr
Dec.: −97.943[1] mas/yr
Parallax (π)20.1236 ± 0.2385 mas[1]
Distance162 ± 2 ly
(49.7 ± 0.6 pc)
Absolute magnitude (MV)+1.34[6]
Details
Mass2.29±0.04[3] M☉
Radius2.0[7] R☉
Luminosity27[6] L☉
Surface gravity (log g)4.33[4] cgs
Temperature9,230[4] K
Metallicity [Fe/H]–0.12[4] dex
Rotational velocity (v sin i)107[8] km/s
Age317[9] Myr
Other designations
ω Aur, 4 Aur, BD+37°1005, HD 31647, HIP 23179, HR 1592, SAO 57548, WDS J04593+3753AB[10]
Database references
SIMBADdata

Omega Aurigae, Latinized from ω Aurigae, is the Bayer designation for a double star[11] in the northern constellation of Auriga. Its apparent magnitude is 4.95,[2] which is bright enough to be seen with the naked eye. The distance to this system, as determined using parallax measurements, is approximately 162 light-years (50 parsecs).[1] The system is a member of the Columba group of co-moving stars.[12]

This is an A-type main sequence star with a stellar classification of A1 V.[4] It is 317[9] million years old with a high rate of spin, showing a projected rotational velocity of 107 km/s.[8] The star has 2.3[3] times the mass of the Sun and double[7] the Sun's radius. It is radiating 27[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,230 K.[4] The object displays an infrared excess, suggesting an orbiting debris disk with a temperature of 20 K at a mean radius of 932.40 AU from the host star.[7] It has a magnitude 8.18 companion at an angular separation of 4.99 arcseconds.[11] The system is an X-ray source with a luminosity of 16.57×1029 ergs s−1.[13]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference aaa294_2_536 was invoked but never defined (see the help page).
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  6. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Cotten2016 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Elliott2016 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Makarov2003 was invoked but never defined (see the help page).