Omega Aurigae

"HR 1592" redirects here. For the legislation, see Matthew Shepard Act.

Omega Aurigae is a double star^[12] in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ω Aurigae, and abbreviated Omega Aur or ω Aur. This star has a combined apparent visual magnitude of 4.95,^[3] 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).^[2] It is receding from the Sun with a radial velocity of +8 km/s.^[6] The system is a member of the Columba group of co-moving stars.^[13]

Omega Aurigae

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga[1]
Right ascension	04h 59m 15.409s[2]
Declination	+37° 53′ 24.88″[2]
Apparent magnitude (V)	4.95[3]
Characteristics
Evolutionary stage	main sequence[4]
Spectral type	A1 V[5]
U−B color index	+0.01[3]
B−V color index	+0.05[3]
R−I color index	0.03
Astrometry
Radial velocity (Rv)	+7.7±2.5[6] km/s
Proper motion (μ)	RA: +45.340 mas/yr[2] Dec.: −97.647 mas/yr[2]
Parallax (π)	20.1236±0.2385 mas[2]
Distance	162 ± 2 ly (49.7 ± 0.6 pc)
Absolute magnitude (MV)	+1.34[1]
Details
ω Aur A
Mass	2.29±0.04[4] M☉
Radius	2.0[7] R☉
Luminosity	27[1] L☉
Surface gravity (log g)	4.33[5] cgs
Temperature	9,230[5] K
Metallicity [Fe/H]	−0.12[5] dex
Rotational velocity (v sin i)	107[8] km/s
Age	317[9] Myr
ω Aur B
Mass	1.1[10] M☉
Other designations
ω Aur, 4 Aur, BD+37°1005, GC 6064, HD 31647, HIP 23179, HR 1592, SAO 57548, PPM 400070, WDS J04593+3753AB[11]
Database references
SIMBAD	data

The primary component is an A-type main sequence star with a stellar classification of A1 V.^[5] 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^[4] times the mass of the Sun and double^[7] the Sun's radius. It is radiating 27^[1] times the Sun's luminosity from its photosphere at an effective temperature of 9,230 K.^[5] 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]

There is a magnitude 8.18 companion at an angular separation of 4.99 arcseconds along a position angle of 4.30°. This corresponds to a physical separation of 234.2 au.^[10] The system is an X-ray source with a luminosity of 16.57×10²⁹ ergs s⁻¹.^[14]