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Delta Herculis
Multiple star system in the constellation Hercules / From Wikipedia, the free encyclopedia
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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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 17h 15m 01.9106s[1] |
Declination | 24° 50′ 21.135″[1] |
Apparent magnitude (V) | 3.126[1] |
Characteristics | |
Spectral type | A3IV[1] |
U−B color index | +0.7[2] |
B−V color index | +0.08[2] |
Astrometry | |
Radial velocity (Rv) | −40.0[1] km/s |
Proper motion (μ) | RA: -21.14[1] mas/yr Dec.: -157.68[1] mas/yr |
Parallax (π) | 43.41 ± 0.15 mas[3] |
Distance | 75.1 ± 0.3 ly (23.04 ± 0.08 pc) |
Absolute magnitude (MV) | +1.31[4] |
Details | |
Mass | 2.4[5] M☉ |
Radius | 2.2[5] R☉ |
Luminosity | 38[5] L☉ |
Temperature | 9,620 ± 350[5] K |
Rotational velocity (v sin i) | 270[6] km/s |
Age | 370[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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