32 Ophiuchi

32 Ophiuchi is a single^[12] star located about 407^[2] light years away from the Sun in the constellation Hercules. It is moving further away from the Sun with a heliocentric radial velocity of +43 km/s.^[1] and is visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 4.97.^[1]

32 Ophiuchi

Observation data Epoch J2000      Equinox J2000
Constellation	Hercules[1]
Right ascension	17h 03m 07.87110s[2]
Declination	+14° 05′ 31.0140″[2]
Apparent magnitude (V)	4.97[1]
Characteristics
Evolutionary stage	asymptotic giant branch[3][4]
Spectral type	M3−III[5]
B−V color index	1.600±0.007[1]
Variable type	suspected[6]
Astrometry
Radial velocity (Rv)	+43.15±0.15[1] km/s
Proper motion (μ)	RA: +25.226[2] mas/yr Dec.: −62.651[2] mas/yr
Parallax (π)	8.0197±0.1498 mas[2]
Distance	407 ± 8 ly (125 ± 2 pc)
Absolute magnitude (MV)	−0.44[1]
Details
Mass	1.60+1.38 −0.75[7] M☉
Radius	63.6±1.2[8] R☉
Luminosity	1,148+111 −193[7] L☉
Surface gravity (log g)	1.90[9] cgs
Temperature	3,728±122[10] K
Metallicity [Fe/H]	−0.07[9] dex
Other designations
32 Oph, NSV 8142, BD+14°3179, HD 154143, HIP 83430, HR 6337, SAO 102553[11]
Database references
SIMBAD	data

This is an aging red giant star on the asymptotic giant branch^[4] with a stellar classification of M3−III.^[5] Having exhausted the supply of hydrogen at its core it has expanded to 63 times the radius of the Sun.^[8] The star is radiating over a thounsand times the luminosity of the Sun^[7] from its swollen photosphere at an effective temperature of around 3,728 K.^[10]

32 Ophiuchi is a suspected variable star with a brightness range of about 0.1 magnitudes.^[6]