N Herculis

n Herculis, also known as 28 Herculis, is a mercury-manganese star^[11] in the constellation Hercules at a distance of approximately 381 light-years (about 117 parsecs) from the Sun. The apparent magnitude of the star is +5.6. Once in the constellation Ophiuchus, it was also catalogued as 11 Ophiuchi.^[10]

n Herculis

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Hercules[1]
Right ascension	16h 32m 35.7s[2]
Declination	+5° 31′ 16″[2]
Apparent magnitude (V)	5.63[3]
Characteristics
Evolutionary stage	main sequence[4]
Spectral type	B9.5III[5]
U−B color index	−0.18[6]
B−V color index	−0.06[6]
Astrometry
Radial velocity (Rv)	−23.38±0.21[2] km/s
Proper motion (μ)	RA: +15.556[2] mas/yr Dec.: −0.282[2] mas/yr
Parallax (π)	8.5519±0.1394 mas[2]
Distance	381 ± 6 ly (117 ± 2 pc)
Absolute magnitude (MV)	+0.27[1]
Details
Mass	2.75[7] M☉
Radius	2.94[7] R☉
Luminosity	99[7] L☉
Surface gravity (log g)	3.94[7] cgs
Temperature	10,623[7] K
Rotational velocity (v sin i)	9.6[8] km/s
Age	237[9] Myr
Other designations
28 Herculis, BD+05°3223, HD 149121, HIP 81007, HR 6158, SAO 121676[10]
Database references
SIMBAD	data