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 |
This article is licensed under the GNU Free Documentation License.
Last updated on Wednesday September 10, 2008 at 15:01:52 PDT (GMT -0700)
View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation
