Wikipedia
32 Ophiuchi
32 Ophiuchi[6] is a single[7] 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[8] 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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 03m 07.87177s[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 mas[1] |
| Distance | 410 ± 10 ly (126 ± 3 pc) |
| Absolute magnitude (MV) | −0.44[2] |
| Details | |
| Mass | 1.60+1.38 −0.75[4] M☉ |
| Radius | 59.92+4.78 −13.93[1] R☉ |
| Luminosity | 614.4±18.2[1] L☉ |
| Temperature | 3,712+525 −140[1] K |
| Metallicity [Fe/H] | 0.00[4] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
References Edit
- ^ a b c d e f g h i j k l 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.
- ^ a b c d e f 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.
- ^ 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 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.
- ^ "HD 154143". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-19.
- ^ "HD 154143 (32 Ophiuchi) Star Facts". Universe Guide. Retrieved August 29, 2019.
- ^ 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.
- ^ 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.