HD 34557
Double star in the constellation Auriga
From Wikipedia, the free encyclopedia
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.[4] They have a combined apparent magnitude of 5.52,[3] 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 244 light years away.[2] The primary component is spinning rapidly, with a projected rotational velocity of 217 km/s.[8] It has a stellar classification of A3V,[5] making it an A-type main sequence star.
Right ascension05h 20m 14.67442s[2]
Declination+41° 05′ 10.4558″[2]
Apparentmagnitude(V)5.52[3] (5.58 + 8.55)[4]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 20m 14.67442s[2] |
| Declination | +41° 05′ 10.4558″[2] |
| Apparent magnitude (V) | 5.52[3] (5.58 + 8.55)[4] |
| Characteristics | |
| Spectral type | A3V[5] |
| Apparent magnitude (G) | 5.41[2] |
| U−B color index | +0.04[3] |
| B−V color index | +0.11[3] |
| Astrometry | |
| Radial velocity (Rv) | 22±4.2[6] km/s |
| Proper motion (μ) | RA: −12.007±0.230[2] mas/yr Dec.: −60.215±0.157[2] mas/yr |
| Parallax (π) | 13.3485±0.1861 mas[2] |
| Distance | 244 ± 3 ly (75 ± 1 pc) |
| Absolute magnitude (MV) | +0.82[1] |
| Details | |
| Radius | 1.6[7] R☉ |
| Rotational velocity (v sin i) | 217[8] km/s |
| Other designations | |
| BD+40°1253, HD 34557, HIP 24902, HR 1738, SAO 40248, Gaia DR3 194864182347584512 | |
| Database references | |
| SIMBAD | data |
