| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h21m 12.68806s[1] |
| Declination | +29° 34′ 11.5926″[1] |
| Apparent magnitude (V) | 5.66[2] |
| Characteristics | |
| Spectral type | A1Vs[3] |
| U−B color index | +0.13[4] |
| B−V color index | +0.06[4] |
| Astrometry | |
| Radial velocity (Rv) | −18.7±0.9[5] km/s |
| Proper motion (μ) | RA: −0.40[1] mas/yr Dec.: +0.91[1] mas/yr |
| Parallax (π) | 11.29 ± 0.32 mas |
| Distance | 289 ± 8 ly (89 ± 3 pc) |
| Orbit[6] | |
| Period (P) | 2.1517 d |
| Eccentricity (e) | 0.0 |
| Periastron epoch (T) | 21140.396 |
| Details | |
| Luminosity | 35[7] L☉ |
| Temperature | 8,682[7] K |
| Rotational velocity (v sin i) | 52[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 34790 is a double-lined spectroscopic binary[9] star system in the northern constellationofAuriga. It has a combined apparent magnitude of 5.66,[2] which means it is faintly visible to the naked eye. Based upon observations by the Hipparcos satellite, it is located around 289 light years away.[1] It has a combined stellar classification of A1Vs,[3] matching that of an A-type main sequence star, and shines with 35 times the luminosity of the Sun.[7]
The two stars orbit each other with a period of only 2.15 days and an eccentricity of zero, indicating their orbit is close to circular.[6] They are orbiting sufficiently close to each other that their rotation periods have most likely become tidally locked—meaning they always maintain the same face toward each other.[9]
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