32 Ophiuchi

32 Ophiuchi[5] is a single[6] star located 410[1] light years away from the Sun in the constellation Hercules. It is visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 4.97.[2] This is an aging red giant star on the asymptotic giant branch[7] with a stellar classification of M3−III.[3] Having exhausted the supply of hydrogen at its core it has expanded to 60[1] times the girth of the Sun. The star is radiating 614[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of around 3,712 K.[1] It is moving further away from the Sun with a heliocentric radial velocity of +43 km/s.[2]

32 Ophiuchi

Observation data Epoch J2000      Equinox J2000
Constellation	Hercules
Right ascension	17^h 03^m 07.87177^s[1]
Declination	+14° 05′ 31.0117″[1]
Apparent magnitude (V)	4.97[2]
Characteristics
Spectral type	M3−III[3]
B−V color index	1.600±0.007[2]
Astrometry
Radial velocity (Rv)	+43.15±0.15[2] km/s
Proper motion (μ)	RA: +24.628[1] mas/yr Dec.: −62.492[1] mas/yr
Parallax (π)	7.9057 ± 0.2050[1] mas
Distance	410 ± 10 ly (126 ± 3 pc)
Absolute magnitude (MV)	−0.44[2]
Details
Radius	59.92+4.78 −13.93[1] R☉
Luminosity	614.4±18.2[1] L☉
Temperature	3,712+525 −140[1] K
Other designations
32 Oph, NSV 8142, BD+14°3179, HD 154143, HIP 83430, HR 6337, SAO 102553[4]
Database references
SIMBAD	data

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
3. Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
4. "HD 154143". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-19.
5. "HD 154143 (32 Ophiuchi) Star Facts". Universe Guide. Retrieved August 29, 2019.
6. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
7. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.