Dabih (Beta Capricorni) is a blue star that can be located in the constellation of Capricornus. Beta Capricorni is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR7776. HIP100345 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD193495. Dabih has alternative name(s), 9 Capricorni , 9 Cap. In Arabic, it is known as Sa'd adh-dhabih.
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 Dabih, the location is 20h 21m 00.65 and -14d46`53.0 .
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 007.38 ± 000.58 towards the north and 044.92 ± 001.09 east if we saw them in the horizon.
Dabih has a spectral type of A5:n. This means the star is a blue star. The star has a B-V Colour Index of 0.79 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,444 Kelvin.
Dabih has been calculated as 27.23 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 18,948,372.75.km.
The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, Beta Capricorni B.
Dabih has an apparent magnitude of 3.05 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 -2.07 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.95. 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.48 which gave the calculated distance to Dabih as 344.05 light years away from Earth or 105.49 parsecs. It would take a spaceship travelling at the speed of light, 344.05 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 9.98 which put Dabih at a distance of 326.82 light years or 100.20 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 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.
|Short Name||9 Cap|
|Arabic Name||Sa'd adh-dhabih|
|English Meaning||The lucky star of 'the slaughterer'|
|Bayer Designation||Beta Capricorni|
|Alternative Name(s)||9 Capricorni|
|Hipparcos Library I.D.||100345|
|Yale Bright Star Catalogue (HR) Id||7776|
|Bonner Durchmusterung||BD-15 5629|
|Henry Draper Designation||193495|
|Absolute Magnitude||-2.07 / -1.95|
|Right Ascension (R.A.)||20h 21m 00.65|
|1997 Distance from Earth||9.48 Parallax (milliarcseconds)|
|344.05 Light Years|
|2007 Revised Distance from Earth||9.98 Parallax (milliarcseconds)|
|326.82 Light Years|
|Proper Motion Dec.||7.38 ± 0.58 milliarcseconds/year|
|Proper Motion RA.||44.92 ± 1.09 milliarcseconds/year|
|Orbital Period (Days)||1374.23|
|Argument Of Periastron||120.10|
|Companion Stars||Beta Capricorni B|
|Radius (x the Sun)||27.23|
|Calculated Effective Temperature||5,444 Kelvin|
The map was generated using Night Vision, an awesome free application by Brian Simpson.