HR 7484
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 38m 41.18316s |
| Declination | +54° 58′ 25.6420″ |
| Apparent magnitude (V) | 5.889±0.015, 6.37 |
| Characteristics | |
| Spectral type | F6V (F5 V + F5 V) |
| B−V color index | 0.482±0.004 |
| Variable type | Algol |
| Astrometry | |
| Radial velocity (Rv) | −13.9±0.2 km/s |
| Proper motion (μ) | RA: +34.885 mas/yr Dec.: +162.839 mas/yr |
| Parallax (π) | 24.7090±0.0422 mas |
| Distance | 132.0 ± 0.2 ly (40.47 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.83 |
| Orbit | |
| Period (P) | 7.64075217±0.00000051 d |
| Semi-major axis (a) | 22.6950 AU |
| Eccentricity (e) | 0.5378±0.0003 |
| Inclination (i) | 87.0±1.0° |
| Argument of periastron (ω) (secondary) | 0.860±0.001° |
| Semi-amplitude (K1) (primary) | 88.02±0.05 km/s |
| Semi-amplitude (K2) (secondary) | 89.97±0.10 km/s |
| Details | |
| V1143 Cyg A | |
| Mass | 1.356±0.003 M☉ |
| Radius | 1.339±0.023 R☉ |
| Luminosity | 2.83±0.2 L☉ |
| Surface gravity (log g) | 4.317±0.015 cgs |
| Temperature | 6,450±100 K |
| Metallicity [Fe/H] | 0.08 dex |
| Rotational velocity (v sin i) | 18±3 km/s |
| V1143 Cyg B | |
| Mass | 1.328±0.002 M☉ |
| Radius | 1.316±0.023 R☉ |
| Luminosity | 2.65±0.2 L☉ |
| Surface gravity (log g) | 4.323±0.015 cgs |
| Temperature | 6,400±100 K |
| Rotational velocity (v sin i) | 28±3 km/s |
| Other designations | |
| V1143 Cyg, HD 185912, HIP 96620, HR 7484, SAO 31850 | |
| Database references | |
| SIMBAD | data |
HR 7484 (V1143 Cyg) is a binary star system in the northern constellation of Cygnus. It is dimly visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.89. Based upon an annual parallax shift of 24.71, it is located 132 light years away. The system is moving closer with a heliocentric radial velocity of −14 km/s.