Theta Aurigae
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 59m 43.269s |
| Declination | +37° 12′ 45.307″ |
| Apparent magnitude (V) | 2.62 |
| Characteristics | |
| Spectral type | A0sp... |
| U-B color index | -0.18 |
| B-V color index | -0.08 |
| R-I color index | -0.06 |
| Variable type | Alpha2 CVn variable |
| Astrometry | |
| Radial velocity (Rv) | 29.5 km/s |
| Proper motion (μ) | RA: 42.09 mas/yr Dec.: -73.61 mas/yr |
| Parallax (π) | 18.83 ± 0.81 mas |
| Distance | 173 ± 7 ly (53 ± 2 pc) |
| Absolute magnitude (MV) | 2.54 |
| Details | |
| Mass | 3,1 M☉ |
| Radius | 2,1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Rotation | 49 Km/s 0,005948457624364 Year |
| Orbit | |
| Companion | CCDM 05597+3713 B |
| Semimajor axis (a) | 3,2" |
| Inclination (i) | 319° |
| Orbit | |
| Companion | CCDM 05597+3713 C |
| Semimajor axis (a) | 50.0" |
| Inclination (i) | 297° |
| Orbit | |
| Companion | CCDM 05597+3713 D |
| Semimajor axis (a) | 130.7" |
| Inclination (i) | 350° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
| Database references | |
| SIMBAD | data |
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 Bogardus and Mahasim, the latter from the Arabic المِعْصَم al-micşam "wrist" (of the charioteer), which was also used for Eta 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.
[edit] 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 |
[edit] References
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