Omicron Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 07m 32.55073s |
| Declination | +28° 45′ 44.9679″ |
| Apparent magnitude (V) | 3.83 |
| Characteristics | |
| Spectral type | B9.5III |
| U−B color index | −0.07 |
| B−V color index | −0.02 |
| Variable type | γ Cas |
| Astrometry | |
| Radial velocity (Rv) | −29.5 km/s |
| Proper motion (μ) | RA: −0.02 mas/yr Dec.: +8.55 mas/yr |
| Parallax (π) | 9.65±0.16 mas |
| Distance | 338 ± 6 ly (104 ± 2 pc) |
| Absolute magnitude (MV) | −1.24 |
| Details | |
| Mass | 3.49±0.04 M☉ |
| Radius | 6.3 R☉ |
| Luminosity | 355 L☉ |
| Surface gravity (log g) | 2.86 cgs |
| Temperature | 9,484 K |
| Metallicity [Fe/H] | −0.06 dex |
| Rotational velocity (v sin i) | 194 km/s |
| Other designations | |
| o Her, 103 Herculis, BD+28 2925, FK5 681, HD 166014, HIP 88794, HR 6779, SAO 85750 | |
| Database references | |
| SIMBAD | data |
Omicron Herculis, Latinized from o Herculis, is a star in the constellation Hercules. It used to be called Masym ("the wrist"), but this name was transferred to Lambda Herculis.