Theta Aurigae information

θ Aurigae
	Location of θ Aurigae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 59m 43.27012s
Declination	+37° 12′ 45.3047″
Apparent magnitude (V)	2.62 - 2.70
Characteristics
Spectral type	A0pSi + F2-5V
U−B color index	−0.18
B−V color index	−0.08
R−I color index	−0.06
Variable type	α2 CVn
Astrometry
Radial velocity (Rv)	+29.5 km/s
Proper motion (μ)	RA: +43.63 mas/yr ; Dec.: −73.79 mas/yr
Parallax (π)	19.70 ± 0.16 mas
Distance	166 ± 1 ly ; (50.8 ± 0.4 pc)
Absolute magnitude (MV)	−1.05
Details
Mass	3.24 M☉
Radius	4.68 R☉
Luminosity	214 L☉
Surface gravity (log g)	3.61 cgs
Temperature	10,220 K
Rotation	3.6187 days
Rotational velocity (v sin i)	55 km/s
Age	288 Myr
Other designations
	Mahasim, 37 Aurigae, BD+37°1380, HD 40312, HIP 28380, HR 2095, SAO 58636, WDS 05597+3713.
Database references
SIMBAD	data

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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Observation data Epoch J2000 Equinox J2000
Location of θ Aurigae (circled)
Constellation	Auriga
Right ascension	05^h 59^m 43.27012^s^[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 (R_v)	+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]
Distance	166 ± 1 ly (50.8 ± 0.4 pc)
Absolute magnitude (M_V)	−1.05^[6]

Details

Mass	3.24^[7] `M`_☉
Radius	4.68^[7] `R`_☉
Luminosity	214^[7] `L`_☉
Surface gravity (log g)	3.61^[7] cgs
Temperature	10,220^[7] K
Rotation	3.6187 days^[8]
Rotational velocity (v sin i)	55^[9] km/s
Age	288^[7] Myr

Other designations
Mahasim, 37 Aurigae, BD+37°1380, HD 40312, HIP 28380, HR 2095, SAO 58636, WDS 05597+3713.
Database references
SIMBAD	data

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