Nu Scorpii
Nu Scorpii (ν Scorpii, abbreviated Nu Sco, ν Sco) is a multiple star system in the constellation of Scorpius. It is most likely a septuple star system, consisting of two close groups (designated Nu Scorpii AB and CD) that are separated by 41 arcseconds. Based on parallax measurements, it is approximately 470 light-years from the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| ν Sco A | |
| Right ascension | 16h 11m 59.740s |
| Declination | −19° 27′ 38.33″ |
| Apparent magnitude (V) | 4.349 |
| ν Sco B | |
| Right ascension | 16h 11m 59.746s |
| Declination | −19° 27′ 36.94″ |
| Apparent magnitude (V) | 6.60 |
| ν Sco CD | |
| Right ascension | 16h 11m 58.603s |
| Declination | −19° 27′ 00.15″ |
| Apparent magnitude (V) | 6.30 |
| Characteristics | |
| ν Sco AB | |
| Spectral type | B3V / ? / ? / ? |
| U−B color index | –0.63 |
| B−V color index | +0.05 |
| ν Sco CD | |
| Spectral type | B9III / B9III / ? |
| U−B color index | –0.37 |
| B−V color index | +0.13 |
| Astrometry | |
| ν Sco AB | |
| Radial velocity (Rv) | 2.4 ± 5 km/s |
| Proper motion (μ) | RA: –7.65 mas/yr Dec.: –23.71 mas/yr |
| Parallax (π) | 6.88 ± 0.76 mas |
| Distance | approx. 470 ly (approx. 150 pc) |
| ν Sco CD | |
| Radial velocity (Rv) | –14 ± 5 km/s |
| Proper motion (μ) | RA: –4.2 mas/yr Dec.: –18.0 mas/yr |
| Orbit | |
| Primary | ν Sco Aa |
| Companion | ν Sco Ab |
| Period (P) | 5.55206 ± 0.00003 |
| Eccentricity (e) | 0.11 ± 0.05 |
| Periastron epoch (T) | 2442185.555 ± 0.349 |
| Argument of periastron (ω) (secondary) | 267 ± 23° |
| Semi-amplitude (K1) (primary) | 26.5 ± 1.3 km/s |
| Other designations | |
| ν Sco AB: BD–19° 4333, HD 145502, HIP 79374, HR 6027, SAO 159764 | |
| ν Sco CD: BD–19° 4332, HD 145501, HR 6026, SAO 159763 | |
| Database references | |
| SIMBAD | ν Sco |
| ν Sco A | |
| ν Sco B | |
| ν Sco CD | |
The component Nu Scorpii Aa is formally named Jabbah /ˈdʒæbə/. (Contrast the similar-sounding Dschubba, Delta Scorpii.)
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