| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 20m 14.66904s[1] |
| Declination | +41° 05′ 10.3522″[1] |
| Apparent magnitude (V) | 5.52[2] (5.58 + 8.55)[3] |
| Characteristics | |
| Spectral type | A3V[4] |
| U−B color index | +0.04[2] |
| B−V color index | +0.11[2] |
| Astrometry | |
| Radial velocity (Rv) | 22±4.2[5] km/s |
| Proper motion (μ) | RA: −18.97[1] mas/yr Dec.: −53.43[1] mas/yr |
| Parallax (π) | 11.77 ± 0.58 mas[1] |
| Distance | 280 ± 10 ly (85 ± 4 pc) |
| Details | |
| Radius | 1.6[6] R☉ |
| Rotational velocity (v sin i) | 217[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 34557 is a double star in the northern constellation of Auriga. The fainter star has an angular separation of 0.380″ from the primary component.[3] They have a combined apparent magnitude of 5.52,[2] making HD 34557 faintly visible to the naked eye from dark skies. Based upon parallax measurements made with the Hipparcos satellite, this system is roughly 280 light years away.[1] The primary component is spinning rapidly, with a projected rotational velocity of 217 km/s.[7] It has a stellar classification of A3V,[4] making it an A-type main sequence star.
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