Eta Aurigae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 06m 30.89337s |
| Declination | +41° 14′ 04.1127″ |
| Apparent magnitude (V) | 3.18 |
| Characteristics | |
| Spectral type | B3 V |
| U−B color index | −0.66 |
| B−V color index | −0.18 |
| R−I color index | −0.17 |
| Variable type | SPB |
| Astrometry | |
| Radial velocity (Rv) | +7.3 km/s |
| Proper motion (μ) | RA: +31.45 mas/yr Dec.: −67.87 mas/yr |
| Parallax (π) | 13.40±0.20 mas |
| Distance | 243 ± 4 ly (75 ± 1 pc) |
| Absolute magnitude (MV) | −1.18 |
| Details | |
| Mass | 5.6±0.1 M☉ |
| Radius | 3.64±0.10 R☉ |
| Luminosity | 1,450±70 L☉ |
| Surface gravity (log g) | 4.13±0.04 cgs |
| Temperature | 18,660±230 K |
| Rotational velocity (v sin i) | 95 km/s |
| Age | 41±6 Myr |
| Other designations | |
| Haedus, η Aur, 10 Aurigae, BD+41°1058, FK5 185, GC 6226, HD 32630, HIP 23767, HR 1641, SAO 40026, PPM 47723 | |
| Database references | |
| SIMBAD | data |
Eta Aurigae is a star in the northern constellation of Auriga. Its identifier is a Bayer designation that is Latinized from η Aurigae, and abbreviated Eta Aur or η Aur. The star is officially named Haedus, pronounced /ˈhiːdəs/. With an apparent visual magnitude of 3.18, it is visible to the naked eye. Based upon parallax measurements made during the Hipparcos mission, this star is approximately 243 light-years (75 parsecs) distant from the Sun. It is receding with a radial velocity of +7 km/s.