Theta Aurigae
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| Observation data Epoch J2000.0 |
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|---|---|
| Constellation | Auriga |
| Right ascension | 05h 59m 43.3s |
| Declination | +37° 12' 45" |
| Apparent magnitude (V) | +2.65 |
| Distance | 173 ± 7 ly (53 ± 2 pc) |
| Spectral type | A0pSi |
| Other designations | |
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 Latin name Bogardus, and also 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 [1].
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
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