Jabbah
| 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 ± 0.76mas |
| 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 | |
Nu Scorpii (ν Sco, 14 Scorpii) also known as Jabbah is a star system in the constellation Scorpius.
It is at least a quintuple star, probably a septuple, consisting of two close groups that are separated by 41 arcseconds.
Since it is near the ecliptic, Nu Scorpii can be occulted by the Moon and, very rarely, by planets. Mercury occulted it on 14 December 1821, but will not occult it again until 2 December 2031. The last occultation by Venus took place on 27 December 1852 and the next will take place on 30 December 2095. On 29 July 1808 there was an occultation by Neptune.
Nu Scorpii is the star which causes the reflection nebula cataloged as IC 4592. Reflection nebulae are actually made up of very fine dust that normally appears dark but can look quite blue when reflecting the light of energetic nearby stars.
Nu Scorpii bears the traditional name Jabbah.
In Chinese astronomy, Nu Scorpii is called 鍵閉, Pinyin: Jiànbì, meaning Door Bolt, because this star is marking itself and stand alone in Door Bolt asterism, Room mansion (see : Chinese constellation). 鍵閉 (Jiànbì), westernized into Keen Pi, but the name Keen Pi was designated for the formation of λ Sco (Shaula) and υ Sco (Lesath) by R.H. Allen and the meaning is "the Two Parts of a Lock." Instead Allen notes the name Jabbah, possibly from Iklīl al Jabhah.
Hierarchy of orbits in the ν Scorpii system
Nu Scorpii is a septuple star system. It is one of only two known systems, the other being AR Cassiopeiae. Higher-multiplicity star systems are uncommon because they are less stable than their simpler counterparts, and often decay into smaller systems.
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