g Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 28m 38.54859s |
| Declination | +41° 52′ 54.0406″ |
| Apparent magnitude (V) | 4.3 - 6.3 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M6− III |
| B−V color index | 1.289±0.024 |
| Variable type | SRb |
| Astrometry | |
| Radial velocity (Rv) | 1.49±0.38 km/s |
| Proper motion (μ) | RA: +30.16 mas/yr Dec.: −5.14 mas/yr |
| Parallax (π) | 9.21±0.18 mas |
| Distance | 354 ± 7 ly (109 ± 2 pc) |
| Absolute magnitude (MV) | −0.41 |
| Orbit | |
| Period (P) | 843.7±21.1 d |
| Eccentricity (e) | 0.37±0.11 |
| Periastron epoch (T) | 2,451,918.2±43.9 HJD |
| Argument of periastron (ω) (secondary) | 246±21° |
| Semi-amplitude (K1) (primary) | 2.3±0.3 km/s |
| Details | |
| g Her A | |
| Mass | 1.65±0.30 M☉ |
| Radius | 230 R☉ |
| Luminosity | 5,395 L☉ |
| Surface gravity (log g) | 0.20 cgs |
| Temperature | 3,263±23 K |
| Metallicity [Fe/H] | −0.01 dex |
| Other designations | |
| g Her, 30 Her, BD+42°2714, FK5 3303, HD 148783, HIP 80704, HR 6146, SAO 46108 | |
| Database references | |
| SIMBAD | data |
g Herculis is a binary star system in the northern constellation of Hercules, which makes part of a wide triple star system. It has the Flamsteed designation 30 Herculis, while g Herculis is the Bayer designation. This system is visible to the naked eye as a faint, red-hued point of light. Based upon a measured parallax of 9.2 mas, it is located around 354 light years away from the Sun. The system is moving further from the Earth with a heliocentric radial velocity of 1.5 km/s.