32 Ophiuchi
Star in the constellation Hercules
From Wikipedia, the free encyclopedia
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]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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]