Theta Aurigae

θ Aurigae
Location of θ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 59m 43.27012s[1]
Declination +37° 12′ 45.3047″[1]
Apparent magnitude (V) 2.62 - 2.70[2]
Characteristics
Spectral type A0pSi + F2-5V[3]
U−B color index −0.18[4]
B−V color index −0.08[4]
R−I color index −0.06
Variable type α2 CVn[2]
Astrometry
Radial velocity (Rv)+29.5[5] km/s
Proper motion (μ) RA: +43.63[1] mas/yr
Dec.: −73.79[1] mas/yr
Parallax (π)19.70 ± 0.16 mas[1]
Distance166 ± 1 ly
(50.8 ± 0.4 pc)
Absolute magnitude (MV)−1.05[6]
Details
Mass3.24[7] M☉
Radius4.68[7] R☉
Luminosity214[7] L☉
Surface gravity (log g)3.61[7] cgs
Temperature10,220[7] K
Rotation3.6187 days[8]
Rotational velocity (v sin i)55[9] km/s
Age288[7] Myr
Other designations
Mahasim, 37 Aurigae, BD+37°1380, HD 40312, HIP 28380, HR 2095, SAO 58636, WDS 05597+3713.
Database references
SIMBADdata

Theta Aurigae (Latinized from θ Aurigae, abbreviated Theta Aur, θ Aur) is a binary star in the constellation of Auriga. Based upon parallax measurements, the distance to this system is about 166 light-years (51 parsecs).[1]

The two components are designated Theta Aurigae A (also named Mahasim[10]) and B.

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