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Jabbah, Nu Scorpii, 14 Scorpii, HD145502, HIP79374

Jabbah (Nu Scorpii) is a blue subgiant star that can be located in the constellation of Scorpius. Jabbah is the brightest star in Scorpius based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Nu Scorpii is the Bayer Classification for the star. HIP79374 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD145502. In Arabic, it is known as Jabhah.

Jabbah is one of the biggest multiple star system that we have so far discovered. It is a Double Binary star system because the stars are pairs rather than all round the same system. At present there are thought to be a quintuple star system consisting of about two groups of stars but it is now thought it might be a septuple (7) star system. The only other star system that has probably the same number of stars as this is AR Cassiopeiae. You might notice that there are only a few of its stars mentioned here.

There is a similar sounding star in the constellation of Leo in case this was not the star that you was after. The name of the other star is Al Jabhah, also known as Eta Leonis. In addition to there being a similar sounding name, the name of the star is similar to the gangster in Star Wars and his name is Jabba, the Hutt who had Han Solo frozen in carbonite before being rescued by Princess Leia. The name for this star comes from the Arabic `The Forehead"

The picture below is of Jabbah in amongst a gas cloud with its siblings. All the stars in the system are all larger than our Sun. The picture was taken by N.A.S.A..

Deep space image of Jabbah

Location of Jabbah

The location of the star in the galaxy is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For Jabbah, the location is 16h 11m 59.74 and -19d27`38.3 .

Proper Motion of Jabbah

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -23.71 ± 0.46 miliarcseconds/year towards the north and -7.65 ± 0.76 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Jabbah

Jabbah has a spectral type of B2IV. This means the star is a blue subgiant star. The star is 7269.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23708.8134753600000000s. The star has a B-V Colour Index of 0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,718 Kelvin.

Jabbah Radius has been calculated as being 8.67 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,033,510.92.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.42. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.02 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

Jabbah Apparent and Absolute Magnitudes

Jabbah has an apparent magnitude of 4.00 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -1.63 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.81. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to Jabbah

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.47 which gave the calculated distance to Jabbah as 436.63 light years away from Earth or 133.87 parsecs. It would take a spaceship travelling at the speed of light, 436.63 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 6.88 which put Jabbah at a distance of 474.07 light years or 145.35 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,269.00 Parsecs or 23,708.81 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Jabbah Facts

Alternative Names

Traditional/Proper NameJabbah
Flamsteed Name14 Scorpii
Flamsteed Short Name14 Sco
Arabic NameJabhah
English Meaning'The Forehead'
Bayer DesignationNu Scorpii
Hipparcos Library I.D.79374
Bonner DurchmusterungBD-19 4333
Henry Draper Designation145502

Visual Facts

Star Typesubgiant star
Absolute Magnitude-1.63 / -1.81
Visual / Apparent Magnitude4.00
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 11m 59.74
Declination (Dec.)-19d27`38.3
Galactic Latitude22.70 degrees
Galactic Longitude354.61 degrees
1997 Distance from Earth7.47 Parallax (milliarcseconds)
 436.63 Light Years
 133.87 Parsecs
2007 Revised Distance from Earth6.88 Parallax (milliarcseconds)
 474.07 Light Years
 145.35 Parsecs
Galacto-Centric Distance23,708.81 Light Years / 7,269.00 Parsecs
Proper Motion Dec.-23.71 ± 0.46 milliarcseconds/year
Proper Motion RA.-7.65 ± 0.76 milliarcseconds/year
B-V Index0.07
Radial Velocity4.10 ± 10.00 km/s
Iron Abundance-0.02 ± 0.04 Fe/H
Spectral TypeB2IV
Colour(B) blue

Estimated Facts

Calculated Effective Temperature8,718 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
145502-19 4333.0A4.40000-11.00000-27.00000B3Blue/White
B6.900001876
145501-19 4332.0C6.50000-10.00000-12.00000AWhite1821
CD7.90000-4.00000-13.000001955

Location of Jabbah in Scorpius


Jabbah (Nu Scorpii) Location in Scorpius

The map was generated using Night Vision, an awesome free application by Brian Simpson.


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