Pi Herculis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 15m 02.83424s |
| Declination | +36° 48′ 32.9816″ |
| Apparent magnitude (V) | +3.15 |
| Characteristics | |
| Spectral type | K3 II |
| U−B color index | +1.66 |
| B−V color index | +1.45 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −25.57±0.20 km/s |
| Proper motion (μ) | RA: −27.402 mas/yr Dec.: 2.925 mas/yr |
| Parallax (π) | 8.8991±0.1323 mas |
| Distance | 367 ± 5 ly (112 ± 2 pc) |
| Absolute magnitude (MV) | −2.10+0.13 −0.12 |
| Details | |
| Mass | 3.77±0.2 M☉ |
| Radius | 64.02+0.89 −0.91 R☉ |
| Luminosity | 1,176±67 L☉ |
| Surface gravity (log g) | 1.26±0.05 cgs |
| Temperature | 4,223±53 K |
| Metallicity [Fe/H] | 0.01±0.1 dex |
| Rotational velocity (v sin i) | 6.12 km/s |
| Age | 220±40 Myr |
| Other designations | |
| Pi Herculis, 67 Herculis, BD+36°2844, FK5 643, HD 156283, HIP 84380, HR 6418, SAO 65890. | |
| Database references | |
| SIMBAD | data |
Pi Herculis (π Her, π Herculis) is a third-magnitude star in the constellation Hercules. As one of the four stars in the Keystone asterism, specifically representing the northeastern corner, it is one of the constellation's more easily recognized. It has an apparent visual magnitude of +3.2, which is visible to the naked eye and makes it one of its brighter members. The Gaia spacecraft mission estimated its distance at roughly 112 parsecs from Earth, or about 367 light years away. The overall reduction in the star's visual magnitude due to extinction from the intervening cosmic dust is 0.11.