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Dabih, Beta Capricorni, 9 Capricorni, HD193495, HIP100345, HR7776

Dabih (Beta Capricorni) is a blue star that can be located in the constellation of Capricornus. Dabih is the brightest star in Capricornus 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.

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. In Arabic, it is known as Sa'd adh-dhabih.

Location of Dabih

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 -14d 46` 53.0 .

Proper Motion of Dabih

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 7.38 ± 0.58 miliarcseconds/year towards the north and 44.92 ± 1.09 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Dabih

Dabih has a spectral type of A5:n. This means the star is a blue star. The star is 7319.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23871.8951473600000000s. 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 Radius has been calculated as being 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. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 25.77. 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 0.46 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, .

Dabih Apparent and Absolute Magnitudes

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.

Distance to Dabih

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 star's Galacto-Centric Distance is 7,319.00 Parsecs or 23,871.90 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.

Dabih Facts

Alternative Names

Traditional/Proper NameDabih
Flamsteed Name9 Capricorni
Flamsteed Short Name9 Cap
Arabic NameSa'd adh-dhabih
English MeaningThe lucky star of 'the slaughterer'
Bayer DesignationBeta Capricorni
Hipparcos Library I.D.100345
Yale Bright Star Catalogue (HR) Id7776
Bonner DurchmusterungBD-15 5629
Henry Draper Designation193495

Visual Facts

Star Type star
Absolute Magnitude-2.07 / -1.95
Visual / Apparent Magnitude3.05
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 21m 00.65
Declination (Dec.)-14d 46` 53.0
Galactic Latitude-26.37 degrees
Galactic Longitude29.15 degrees
1997 Distance from Earth9.48 Parallax (milliarcseconds)
 344.05 Light Years
 105.49 Parsecs
2007 Revised Distance from Earth9.98 Parallax (milliarcseconds)
 326.82 Light Years
 100.20 Parsecs
Galacto-Centric Distance23,871.90 Light Years / 7,319.00 Parsecs
Proper Motion Dec.7.38 ± 0.58 milliarcseconds/year
Proper Motion RA.44.92 ± 1.09 milliarcseconds/year
B-V Index0.79
Radial Velocity-19.00 ± 0.60 km/s
Iron Abundance0.46 ± 9.99 Fe/H
Semi-Major Axis28.75
Orbital Period (Days)1374.23
Argument Of Periastron120.10
Spectral TypeA5:n
Colour(A) blue

Estimated Facts

Calculated Effective Temperature5,444 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Dabih in Capricornus

Dabih (Beta Capricorni) Location in Capricornus

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

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