Omicron Herculis

o Herculis
Location of o Herculis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 18h 07m 32.55073s[1]
Declination +28° 45′ 44.9679″[1]
Apparent magnitude (V) 3.83[2]
Characteristics
Spectral type B9.5III[3]
U−B color index −0.07[2]
B−V color index −0.02[2]
Variable type γ Cas[4]
Astrometry
Radial velocity (Rv)−29.5[5] km/s
Proper motion (μ) RA: −0.02[1] mas/yr
Dec.: +8.55[1] mas/yr
Parallax (π)9.65 ± 0.16 mas[1]
Distance338 ± 6 ly
(104 ± 2 pc)
Absolute magnitude (MV)−1.24[6]
Details
Mass3.49±0.04[7] M☉
Radius6.3[8] R☉
Luminosity355 L☉
Surface gravity (log g)2.86[9] cgs
Temperature9,484[8] K
Metallicity [Fe/H]−0.06[6] dex
Rotational velocity (v sin i)194[10] km/s
Other designations
o Her, 103 Herculis, BD+28 2925, FK5 681, HD 166014, HIP 88794, HR 6779, SAO 85750
Database references
SIMBADdata

Omicron Herculis, Latinized from o Herculis, is a star in the constellation Hercules. It used to be called Masym ("the wrist"), but this name was transferred to Lambda Herculis.[11]

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