 Reddish ζ Scorpii alongside the fainter ζ Scorpii to the south of NGC 6231 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16 54 35.00503 |
| Declination | −42° 21′ 40.7370″ |
| Apparent magnitude (V) | 3.59 to 3.65 |
| Characteristics | |
| Spectral type | K4 III |
| U−B color index | +1.65 |
| B−V color index | +1.37 |
| R−I color index | +0.68 |
| Astrometry | |
| Radial velocity (Rv) | −18.7±0.9 km/s |
| Proper motion (μ) | RA: −126.721 mas/yr Dec.: −228.837 mas/yr |
| Parallax (π) | 24.2353 ± 0.1985 mas |
| Distance | 135 ± 1 ly (41.3 ± 0.3 pc) |
| Absolute magnitude (MV) | 0.30±0.09 |
| Details | |
| Mass | 1.19±0.14 M☉ |
| Radius | 21.0±1.6 R☉ |
| Surface gravity (log g) | 1.84±0.10 cgs |
| Temperature | 4,169 K |
| Metallicity | +0.06 dex |
| Rotational velocity (v sin i) | 2.30 km/s |
| Age | 5.80±2.26 Gyr |
| Other designations | |
| ζ Sco, Zeta Scorpii, Zeta Sco, CD−42 11646, CPD−42 7549, GC 22751, HD 152334, HIP 82729, HR 6271, LTT 6737, NLTT 43744, PPM 322371, SAO 227402. | |
| Database references | |
| SIMBAD | data |
Zeta Scorpii (Zeta Sco, ζ Scorpii, ζ Sco) is a K-type orange giant star in the constellation of Scorpius. It has an apparent visual magnitude which varies between 3.59 and 3.65, and is located near the blue-white supergiant star ζ Scorpii in Earth's sky. In astronomical terms, ζ is much closer to the Sun and unrelated to ζ except for line-of sight co-incidence. ζ is about 6,000 light-years away and probably an outlying member of open star cluster NGC 6231 (also known as the "northern jewel box" cluster), whereas ζ is a mere 135 light-years distant and thus much less luminous in real terms. ζ can also be distinguished from its optical partner, ζ, because of its orangish colour especially in long-exposure astrophotographs.
References
- ^ 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.
- ^ 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, Bibcode:1966ApJ...146..587L, doi:10.1086/148925.
- ^ 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, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
- ^ da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088.
- 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, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931, A50.
- ^ "zet02 Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-20.
