Gamma Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 21m 55.21440s |
| Declination | +19° 09′ 11.2618″ |
| Apparent magnitude (V) | +3.75 |
| Characteristics | |
| Spectral type | A9 IIIbn |
| U−B color index | +0.18 |
| B−V color index | +0.27 |
| Variable type | SRd? |
| Astrometry | |
| Radial velocity (Rv) | –35.3 km/s |
| Proper motion (μ) | RA: –47.39 mas/yr Dec.: +43.81 mas/yr |
| Parallax (π) | 16.93±0.22 mas |
| Distance | 193 ± 3 ly (59.1 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.12 |
| Details | |
| Radius | 6 R☉ |
| Luminosity | 92 L☉ |
| Surface gravity (log g) | 3.3 cgs |
| Temperature | 7,031 K |
| Metallicity [Fe/H] | +0.07 dex |
| Rotational velocity (v sin i) | 135 km/s |
| Other designations | |
| γ Her, 20 Herculis, BD+19°3086, HD 147547, HIP 80170, HR 6095, SAO 102107 | |
| Database references | |
| SIMBAD | data |
Gamma Herculis, Latinized from γ Herculis, is a magnitude 3.74 binary star system in the northern constellation of Hercules. It is easily visible to the naked eye under good observing conditions.