Iota Herculis

Iota Herculis

Historical view of the Hercules constellation showing Iota Herculis as one of the hero's feet
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 39m 27.8864s[1]
Declination +46° 00′ 22.795″[1]
Apparent magnitude (V) 3.80[2]
Characteristics
Spectral type B3IV[1]
U−B color index –0.71
B−V color index –0.18[3]
Variable type Beta Cephei[4]
Astrometry
Radial velocity (Rv)–20.0[1] km/s
Proper motion (μ) RA: 7.48[5] mas/yr
Dec.: 4.53[5] mas/yr
Parallax (π)7.17 ± 0.13 mas[5]
Distance455 ± 8 ly
(139 ± 3 pc)
Absolute magnitude (MV)–1.97[6]
Details
Mass6.7 ± 0.1[7] M☉
Radius5.29 ± 0.45[8] R☉
Luminosity2,489[2] L☉
Surface gravity (log g)3.82 ± 0.06[8] cgs
Temperature18,070 ± 294[8] K
Metallicity [Fe/H]–0.40[9] dex
Rotational velocity (v sin i)6±1[2] km/s
Age37.8 ± 8.6[7] 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
SIMBADdata

Iota Herculis (ι Herculis, ι Her) is a fourth-magnitude variable star system in the constellation Hercules, consisting of at least four stars all about 139 parsecs (450 light-years) away. The brightest is a β Cephei variable, a pulsating star.

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