Iota Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 39m 27.8864s |
| Declination | +46° 00′ 22.795″ |
| Apparent magnitude (V) | 3.80 |
| Characteristics | |
| Spectral type | B3IV |
| U−B color index | −0.71 |
| B−V color index | −0.18 |
| Variable type | Beta Cephei |
| Astrometry | |
| Radial velocity (Rv) | −21.23±0.20 km/s |
| Proper motion (μ) | RA: +7.48 mas/yr Dec.: +4.53 mas/yr |
| Parallax (π) | 7.17±0.13 mas |
| Distance | 455 ± 8 ly (139 ± 3 pc) |
| Absolute magnitude (MV) | −1.97 |
| Orbit | |
| Period (P) | 111.5±0.1 days |
| Semi-major axis (a) | ≥12.68±0.74 R☉ |
| Eccentricity (e) | 0.53±0.03 |
| Argument of periastron (ω) (secondary) | 208.3+5.2 −5.0° |
| Semi-amplitude (K1) (primary) | 6.8+0.4 −0.3 km/s |
| Details | |
| Mass | 5.40+0.12 −0.08 M☉ |
| Radius | 4.74±0.34 R☉ |
| Luminosity | 2,489 L☉ |
| Surface gravity (log g) | 3.61±0.02 cgs |
| Temperature | 14,346+104 −96 K |
| Metallicity [Fe/H] | −0.40 dex |
| Rotational velocity (v sin i) | 6±1 km/s |
| Age | 37.8±8.6 Myr |
| Other designations | |
| ι Her, 85 Her, HR 6588, BD+46°2349, HD 160762, FK5 663, HIP 86414, SAO 46872, GC 23965, CCDM J17395+4601A | |
| Database references | |
| SIMBAD | data |
Iota Herculis (ι Herculis, ι Her) is a fourth-magnitude binary star in the constellation Hercules, 139 parsecs (450 light-years) away. The brightest is a β Cephei variable, a pulsating star.