| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16 57 49.83[1] |
| Declination | +35 20 32.6[1] |
| Apparent magnitude (V) | 13.83[1] |
| Spectral type | DA[1] |
| Other designations | |
4U 1656+35, HZ Her | |
| Database references | |
| SIMBAD | data |
Hercules X-1 (Her X-1), also known as 4U1656+35, is a moderately strong X-ray binary source first studied by the Uhuru satellite. It is composed of a neutron star accreting matter from a normal star (HZ Her) probably due to Roche lobe overflow.