Astronomy:Zeta2 Scorpii
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Short description: Star in the constellation Scorpius.
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 54m 35.00435s[1] |
| Declination | −42° 21′ 40.7407″[1] |
| Apparent magnitude (V) | 3.59 to 3.65[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| U−B color index | +1.65[4] |
| B−V color index | +1.37[4] |
| R−I color index | +0.68[4] |
| Astrometry | |
| Radial velocity (Rv) | −18.7±0.9[5] km/s |
| Proper motion (μ) | RA: −127.72[1] mas/yr Dec.: −229.44[1] mas/yr |
| Parallax (π) | 24.65 ± 0.27[1] mas |
| Distance | 132 ± 1 ly (40.6 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.30±0.09[6] |
| Details | |
| Mass | 1.19±0.14[6] M☉ |
| Radius | 21.0±1.6[6] R☉ |
| Surface gravity (log g) | 1.84±0.10[6] cgs |
| Temperature | 4,169[6] K |
| Metallicity [Fe/H] | +0.06[6] dex |
| Rotational velocity (v sin i) | 2.30[7] km/s |
| Age | 5.80±2.26[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Reddish ζ2 Scorpii alongside the fainter ζ1 Scorpii to the south of NGC 6231
Zeta2 Scorpii (Zeta2 Sco, ζ2 Scorpii, ζ2 Sco) is a K-type orange giant star in the constellation of Scorpius.[8] It has an apparent visual magnitude which varies between 3.59 and 3.65,[2] and is located near the blue-white supergiant star ζ1 Scorpii in Earth's sky. In astronomical terms, ζ2 is much closer to the Sun and unrelated to ζ1 except for line-of sight co-incidence. ζ1 is 5,700 light-years away and probably an outlying member of open star cluster NGC 6231 (also known as the "northern jewel box" cluster), whereas ζ2 is a mere 132 lightyears distant and thus much less luminous in real terms. ζ2 can also be distinguished from its optical partner, ζ1, because of its orangish colour especially in long-exposure astrophotographs.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 NSV 8028, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 20, 2009.
- ↑ Landi Dessy, J.; Keenan, P. C. (November 1966), "Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6", Astrophysical Journal 146: 587, doi:10.1086/148925, Bibcode: 1966ApJ...146..587L.
- ↑ 4.0 4.1 4.2 HR 6271, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 20, 2009.
- ↑ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 (University of Toronto: International Astronomical Union) 30: p. 57, Bibcode: 1967IAUS...30...57E.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 da Silva, L. et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics 458 (2): 609–623, doi:10.1051/0004-6361:20065105, Bibcode: 2006A&A...458..609D.
- ↑ Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, A50, Bibcode: 2015A&A...574A..50J.
- ↑ 8.0 8.1 "zet02 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet02+Sco.
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