HD 34790
Binary star system in the constellation Auriga
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HD 34790 is a double-lined spectroscopic binary[9] star system in the northern constellation of Auriga. It has a combined apparent magnitude of 5.66,[3] which means it is faintly visible to the naked eye. Based upon observations by the Gaia space telescope, it is located around 317 light-years away.[2] It has a combined stellar classification of A1Vs,[4] matching that of an A-type main sequence star.
The star | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 21m 12.68743s[2] |
| Declination | +29° 34′ 11.5927″[2] |
| Apparent magnitude (V) | 5.66[3] |
| Characteristics | |
| Spectral type | A1Vs[4] |
| U−B color index | +0.13[5] |
| B−V color index | +0.06[5] |
| Astrometry | |
| Radial velocity (Rv) | −18.7±0.9[6] km/s |
| Proper motion (μ) | RA: −1.073 mas/yr[2] Dec.: +0.880 mas/yr[2] |
| Parallax (π) | 10.2807±0.0695 mas[2] |
| Distance | 317 ± 2 ly (97.3 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.93[1] |
| Orbit[7] | |
| Period (P) | 2.1517 d |
| Eccentricity (e) | 0.0 |
| Periastron epoch (T) | 21140.396 |
| Details | |
| A | |
| Mass | 2.70[8] M☉ |
| B | |
| Mass | 2.35[8] M☉ |
| Other designations | |
| BD+29°869, HD 34790, HIP 25001, HR 1752, SAO 77124 | |
| Database references | |
| SIMBAD | data |
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.[7] 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]
A faint third star 204″ away, shares a common proper motion and almost identical parallax. Any orbit is likely to take over a million years.[8] The star is a faint red dwarf.[10]