Zeta2 Scorpii
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Scorpius |
Right ascension | 16h 54m 35.0053s[1] |
Declination | −42° 21′ 40.726″[1] |
Apparent magnitude (V) | 3.59 to 3.65[2] |
Characteristics | |
Spectral type | K4III[1] |
U−B color index | +1.65[3] |
B−V color index | +1.37[3] |
R−I color index | +0.68[3] |
Astrometry | |
Radial velocity (Rv) | −18.7 ± 0.9[1] km/s |
Proper motion (μ) | RA: −126.55[1] mas/yr Dec.: −227.77[1] mas/yr |
Parallax (π) | 21.67 ± 0.85[1] mas |
Distance | 151 ± 6 ly (46 ± 2 pc) |
Absolute magnitude (MV) | 0.30 ± 0.09[4] |
Details | |
Mass | 1.19 ± 0.14[4] M☉ |
Radius | 21.0 ± 1.6[4] R☉ |
Surface gravity (log g) | 1.84 ± 0.10[4] cgs |
Temperature | 4,169[4] K |
Metallicity [Fe/H] | +0.06[4] dex |
Age | 5.80 ± 2.26[4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
- For other stars with this Bayer designation, see Zeta Scorpii.
Zeta2 Scorpii (Zeta2 Sco, ζ2 Scorpii, ζ2 Sco) is a K-type orange giant star in the constellation of Scorpius.[1] 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 our 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 151 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 astrophographs.
References
- 1 2 3 4 5 6 7 8 9 NSV 8028 -- Variable Star, database entry, SIMBAD. Accessed on line November 20, 2009.
- 1 2 NSV 8028, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 20, 2009.
- 1 2 3 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.
- 1 2 3 4 5 6 7 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
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