50 Draconis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 18h 46m 22.24188s |
| Declination | +75° 26′ 02.2400″ |
| Apparent magnitude (V) | 5.369±0.001 (5.997 + 6.238) |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | A2Vp |
| Variable type | Rotating ellipsoidal variable |
| Astrometry | |
| Radial velocity (Rv) | −6.53±0.09 km/s |
| Proper motion (μ) | RA: −17.061 mas/yr Dec.: +70.391 mas/yr |
| Parallax (π) | 11.4150±0.1058 mas |
| Distance | 286 ± 3 ly (87.6 ± 0.8 pc) |
| Absolute magnitude (MV) | +0.70 |
| Orbit | |
| Period (P) | 4.117719(2) days |
| Semi-major axis (a) | 13.184±0.026 R☉ |
| Eccentricity (e) | 0.0021±0.0003 |
| Inclination (i) | 49.9±0.8° |
| Argument of periastron (ω) (secondary) | 94.85±0.02° |
| Semi-amplitude (K1) (primary) | 78.93±0.02 km/s |
| Semi-amplitude (K2) (secondary) | 82.96±0.20 km/s |
| Details | |
| 50 Dra A | |
| Mass | 2.08±0.08 M☉ |
| Radius | 2.06±0.09 R☉ |
| Surface gravity (log g) | 4.13±0.05 cgs |
| Temperature | 9,800±100 K |
| Metallicity [Fe/H] | +0.21±0.09 dex |
| Rotation | 4.117719(2) days |
| Rotational velocity (v sin i) | 19±1 km/s |
| 50 Dra B | |
| Mass | 1.97±0.08 M☉ |
| Radius | 1.99±0.09 R☉ |
| Surface gravity (log g) | 4.13±0.05 cgs |
| Temperature | 9,200±200 K |
| Metallicity [Fe/H] | +0.08±0.10 dex |
| Rotation | 4.117719(2) days |
| Rotational velocity (v sin i) | 19±1 km/s |
| Other designations | |
| BD+75°682, HD 175286, HIP 92112, HR 7124, TYC 4583-2839-1 | |
| Database references | |
| SIMBAD | data |
50 Draconis is a binary star in the constellation Draco. At an apparent magnitude of +5.369, it is faintly visible to the naked eye in locations far from light pollution. Parallax measurements give a distance of 286 light-years (88 parsecs).