HD 6114
Binary star system in the constellation Andromeda
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HD 6114 is a visual binary star system in the northern constellation of Andromeda. With a combined apparent magnitude of 6.46,[1] the star can only be seen with the naked eye by keen-eyed observers even on the best of nights. Based upon an annual parallax shift of 10.4 mas[2] as seen from Earth's orbit, the system is located approximately 108 parsecs (350 ly) distant.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda[1] |
| HD 6114 A | |
| Right ascension | 01h 03m 01.54722s[2] |
| Declination | +47° 22′ 34.1796″[2] |
| Apparent magnitude (V) | 6.76[3] |
| HD 6114 B | |
| Right ascension | 01h 03m 01.55854s[4] |
| Declination | +47° 22′ 33.0207″[4] |
| Apparent magnitude (V) | 8.07[3] |
| Characteristics | |
| Spectral type | A9 V[5][6] |
| Apparent magnitude (V) | 6.46[1] |
| B−V color index | 0.248±0.012[1] |
| Astrometry | |
| HD 6114 A | |
| Radial velocity (Rv) | +2.4±2.8[7] km/s |
| Proper motion (μ) | RA: 87.411±0.040[2] mas/yr Dec.: −15.153±0.024[2] mas/yr |
| Parallax (π) | 9.2058±0.0392 mas[2] |
| Distance | 354 ± 2 ly (108.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.56[1] |
| HD 6114 B | |
| Proper motion (μ) | RA: 87.190±0.103[4] mas/yr Dec.: −23.426±0.042[4] mas/yr |
| Parallax (π) | 9.4797±0.0651 mas[4] |
| Distance | 344 ± 2 ly (105.5 ± 0.7 pc) |
| Orbit[8] | |
| Period (P) | 450 yr |
| Semi-major axis (a) | 0.816″ |
| Eccentricity (e) | 0.80 |
| Inclination (i) | 87.0° |
| Longitude of the node (Ω) | 176.7° |
| Periastron epoch (T) | 1902.0 |
| Argument of periastron (ω) (secondary) | 180° |
| Details | |
| HD 6114 A | |
| Mass | 1.65[9] M☉ |
| Luminosity | 21.2+3.5 −3.0[10] L☉ |
| Surface gravity (log g) | 4.03±0.14[9] cgs |
| Temperature | 7,611±259[9] K |
| Rotational velocity (v sin i) | 149[10] km/s |
| Age | 863[9] Myr |
| Other designations | |
| BD+46°243, HD 6114, HIP 4911, HR 289, SAO 36875, ADS 862, WDS J01030+4723[11] | |
| Database references | |
| SIMBAD | data |
The binary nature of this system was discovered by O. Struve in 1864. It consists of a magnitude 6.76 primary component with a dimmer magnitude 8.07 secondary. As of 2015 the pair had an angular separation of 1.30″ along a position angle of 175°.[3] The two stars orbit each other with a period of 450 years with an eccentricity of 0.80.[8]
The primary is an A-type main-sequence star with a stellar classification of A9 V.[5][6] At the estimated age of 863 million years, it is spinning rapidly with a projected rotational velocity of 149 km/s.[10] The star has 1.65[9] times the mass of the Sun and is radiating 21[10] times the Sun's luminosity from its photosphere at an effective temperature of 7,611 K.[9]