Delta Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 15m 01.9106s |
| Declination | +24° 50′ 21.135″ |
| Apparent magnitude (V) | 3.126 |
| Characteristics | |
| Spectral type | A3IV |
| U−B color index | +0.7 |
| B−V color index | +0.08 |
| Astrometry | |
| Radial velocity (Rv) | −40.0 km/s |
| Proper motion (μ) | RA: -21.14 mas/yr Dec.: -157.68 mas/yr |
| Parallax (π) | 43.41±0.15 mas |
| Distance | 75.1 ± 0.3 ly (23.04 ± 0.08 pc) |
| Absolute magnitude (MV) | +1.31 |
| Details | |
| Mass | 2.4 M☉ |
| Radius | 2.2 R☉ |
| Luminosity | 38 L☉ |
| Temperature | 9,620 ± 350 K |
| Rotational velocity (v sin i) | 270 km/s |
| Age | 370 Myr |
| Other designations | |
| Sarin, δ Her, 65 Her, BD+25°3221, CCDM J17151+2451A, FK5 641, GC 23294, HD 156164, HIP 84379, HR 6410, SAO 84951 | |
| Database references | |
| SIMBAD | data |
Delta Herculis (δ Herculis, abbreviated Delta Her, δ Her) is a multiple star system in the constellation of Hercules. Its light produces to us apparent magnitude 3.12, as such the third-brightest star in the large, fairly dim constellation. Based on parallax measurement taken during the Hipparcos mission, it is approximately 23.1 parsecs (75 light-years) from the Sun.