| 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) | 0.3[4] |
| Details | |
| Mass | 1.8 - 2 M☉ |
| Radius | 48[5] R☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 Zeta-1 Scorpii in our sky, although it is, in astronomical terms, far more distant and unrelated to Zeta-1 Scorpii except for line-of sight co-incidence. Zeta-1 is five thousand seven hundred light-years away and probably an outlying member of open star cluster NGC 6231, also known as the "northern jewel box" cluster, whereas Zeta-2 is a mere 155 lightyears distant and thus much less luminous in real terms. Zeta-2 Scorpii can also be distinguished from its optical partner, Zeta-1, because of Zeta-2's orangish colour especially in long-exposure astrophographs.
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