32 Ophiuchi
32 Ophiuchi is a single star located about 407 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. and is visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 4.97. This is an aging red giant star on the asymptotic giant branch with a stellar classification of M3−III. Having exhausted the supply of hydrogen at its core it has expanded to 63 times the radius of the Sun. The star is radiating over a thounsand times the luminosity of the Sun from its swollen photosphere at an effective temperature of around 3,728 K. 32 Ophiuchi is a suspected variable star with a brightness range of about 0.1 magnitudes.
| 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 |
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]
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]
References
[edit]- ^ a b c d e f g 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. XHIP record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Lebzelter, Thomas; Hinkle, Kenneth H.; Straniero, Oscar; Lambert, David L.; Pilachowski, Catherine A.; Nault, Kristie A. (2019), "Carbon and Oxygen Isotopic Ratios. II. Semiregular Variable M Giants", The Astrophysical Journal, 886 (2): 117, arXiv:1912.04386, Bibcode:2019ApJ...886..117L, doi:10.3847/1538-4357/ab4e9b.
- ^ a b 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.
- ^ a b 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.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2004), "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)", Vizier Online Data Catalog, Bibcode:2004yCat.2250....0S.
- ^ a b c Charbonnel, C.; et al. (January 2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy & Astrophysics, 633: A34, arXiv:1910.12732, Bibcode:2020A&A...633A..34C, doi:10.1051/0004-6361/201936360, ISSN 0004-6361.
- ^ a b Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (2025-05-07), "Vintage NPOI: New and Updated Angular Diameters for 145 Stars", The Astronomical Journal, 169 (6): 293, arXiv:2506.02912, Bibcode:2025AJ....169..293B, doi:10.3847/1538-3881/adc930, ISSN 1538-3881.
- ^ a b Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024), "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost", Astronomy and Astrophysics, 691: A98, arXiv:2407.06963, Bibcode:2024A&A...691A..98K, doi:10.1051/0004-6361/202451427.
- ^ a b Deacon, N. R.; Henning, Th; Kossakowski, D. E. (2019), "Data-driven stellar parameters for southern TESS FGK targets", Monthly Notices of the Royal Astronomical Society, 486 (1): 251, arXiv:1903.03115, Bibcode:2019MNRAS.486..251D, doi:10.1093/mnras/stz722.
- ^ "HD 154143". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-19.
- ^ 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.
