Iota Herculis information

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
Declination	+46° 00′ 22.795″
Apparent magnitude (V)	3.80
Characteristics
Spectral type	B3IV
U−B color index	–0.71
B−V color index	–0.18
Variable type	Beta Cephei
Astrometry
Radial velocity (Rv)	–20.0 km/s
Proper motion (μ)	RA: 7.48 mas/yr ; Dec.: 4.53 mas/yr
Parallax (π)	7.17 ± 0.13 mas
Distance	455 ± 8 ly ; (139 ± 3 pc)
Absolute magnitude (MV)	–1.97
Details
Mass	6.7 ± 0.1 M☉
Radius	5.29 ± 0.45 R☉
Luminosity	2,489 L☉
Surface gravity (log g)	3.82 ± 0.06 cgs
Temperature	18,070 ± 294 K
Metallicity [Fe/H]	–0.40 dex
Rotational velocity (v sin i)	6±1 km/s
Age	37.8 ± 8.6 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
SIMBAD	data

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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Observation data Epoch J2000 Equinox J2000
Historical view of the Hercules constellation showing Iota Herculis as one of the hero's feet
Constellation	Hercules
Right ascension	17^h 39^m 27.8864^s^[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 (R_v)	–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]
Distance	455 ± 8 ly (139 ± 3 pc)
Absolute magnitude (M_V)	–1.97^[6]

Details

Mass	6.7 ± 0.1^[7] `M`_☉
Radius	5.29 ± 0.45^[8] `R`_☉
Luminosity	2,489^[2] `L`_☉
Surface gravity (log g)	3.82 ± 0.06^[8] cgs
Temperature	18,070 ± 294^[8] K
Metallicity [Fe/H]	–0.40^[9] dex
Rotational velocity (v sin i)	6±1^[2] km/s
Age	37.8 ± 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
SIMBAD	data

Iota Herculis information

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