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Theta_Aurigae

Theta Aurigae

Theta Aurigae (θ Aur / θ Aurigae) is a binary star in the constellation Auriga. It is approximately 173 light-years from Earth. Rarely used proper names for this star include the Arabic name Maha-Sim or Mahasim, which is a variant of the Arabic name Al-Mi'sam meaning "wrist" that was used to describe both Eta Aurigae and Theta Aurigae

The primary, θ Aurigae A, is a white A-type main sequence dwarf with an apparent magnitude of +2.7. It's companion, θ Aurigae B, is a yellow G-type main sequence dwarf with an apparent magnitude of +7.2. The two stars are separated by 3.5 arcseconds. A third star, the 11th magnitude θ Aurigae C, is 49 arcseconds away, and is an optical companion.

The mean combined apparent magnitude of the system is +2.65 but the primary is an Alpha2 Canum Venaticorum type variable star so the system's brightness varies from magnitude +2.62 to +2.70 with a period of 1.37 days.

It is known as 五車四 (the Fourth Star of the Five Chariots) in Chinese.

Reference

Components

NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
ADS 4566 B (BD+37 1380B) 05h 59m 42s +37° 13' 00 14.4 G2V Simbad
ADS 4566 C (BD+37 1380C) 05h 59m 39.4s +37° 13' 11 10.7 Simbad
ADS 4566 D (BD+37 1379) 05h 59m 41.122s +37° 14' 59.69'' 12.1 Simbad

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