Zeta2 Scorpii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| 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
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<references />, or <references group="..." />- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 NSV 8028 -- Variable Star, database entry, SIMBAD. Accessed on line November 20, 2009.
- ↑ 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.
- ↑ 3.0 3.1 3.2 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.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Lua error in package.lua at line 80: module 'strict' not found.
