Delta Aurigae
 Location of δ Aurigae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 59m 31.63201s |
| Declination | +54° 17′ 04.7703″ |
| Apparent magnitude (V) | 3.715 |
| Characteristics | |
| Spectral type | K0 III |
| U−B color index | +0.837 |
| B−V color index | +1.017 |
| R−I color index | 0.5 |
| Astrometry | |
| Radial velocity (Rv) | +8.2 km/s |
| Proper motion (μ) |
RA: +81.81 mas/yr Dec.: –132.98 mas/yr |
| Parallax (π) | 25.88 ± 1.61mas |
| Distance | 126 ± 8 ly (39 ± 2 pc) |
| Details | |
| Radius | 11 R☉ |
| Luminosity | 62 L☉ |
| Surface gravity (log g) | 2.7 cgs |
| Temperature | 4,786 K |
| Metallicity [Fe/H] | –0.15 dex |
| Rotational velocity (v sin i) | 3.9 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Aurigae (δ Aur, δ Aurigae) is the Bayer designation for an astrometric binarystar in the constellation Auriga. It is visible to the naked eye with an apparent visual magnitude of 3.715. Based upon its annual parallax shift of 25.88 mas, it is some 126 light-years (39 parsecs) distant from the Earth, give or take an eight light-year margin of error. This star is the namesake for the Delta Aurigids, a meteor shower that occurs between October 6–15. The radiant point for this shower passes several degrees to the south of the star.
Delta Aurigae is a spectroscopic binary: periodic Doppler shifts in the star's spectrum indicate orbital motion. The visible component of this system is a giant star with a stellar classification of K0 III. It has 11 times the radius of the Sun and shines with 62 times the Sun's luminosity. This energy is being radiated from the star's outer envelope at an effective temperature of 4,786 K. This heat gives the star the orange-hued glow of a K-type star. Delta Aurigae has an orbital period of 1,283.4 days (3.514 years) and an eccentricity of 0.231.
In Indian astronomy, it is known by the Sanskrit name Prajāpati (प्रजापति), "the Lord of Creation".
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