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Al Kurud, Theta Columbae, HD42167, HIP29034, HR2177

Al Kurud (Theta Columbae) is a blue subgiant star that can be located in the constellation of Columba. Al Kurud is the brightest star in Columba 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.

Theta Columbae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2177. HIP29034 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD42167.

Location of Al Kurud

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 Al Kurud, the location is 06h 07m 31.63 and -37d 15` 10.5 .

Proper Motion of Al Kurud

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 0.41 ± 0.14 miliarcseconds/year towards the north and 0.12 ± 0.16 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Al Kurud

Al Kurud has a spectral type of B8:IV. This means the star is a blue subgiant star. The star is 7491.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24432.8960990400000000s. The star has a B-V Colour Index of -0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,375 Kelvin.

Al Kurud Radius has been calculated as being 5.61 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,903,939.55.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 5.31. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Al Kurud Apparent and Absolute Magnitudes

Al Kurud has an apparent magnitude of 5.00 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 -1.84 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.72. 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 Al Kurud

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.28 which gave the calculated distance to Al Kurud as 762.06 light years away from Earth or 233.64 parsecs. It would take a spaceship travelling at the speed of light, 762.06 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 4.52 which put Al Kurud at a distance of 721.60 light years or 221.24 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 7,491.00 Parsecs or 24,432.90 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.

Al Kurud Facts

Alternative Names

Traditional/Proper NameAl Kurud
Bayer DesignationTheta Columbae
Hipparcos Library I.D.29034
Yale Bright Star Catalogue (HR) Id2177
Henry Draper Designation42167

Visual Facts

Star Typesubgiant star
Absolute Magnitude-1.84 / -1.72
Visual / Apparent Magnitude5.00
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 07m 31.63
Declination (Dec.)-37d 15` 10.5
Galactic Latitude-24.26 degrees
Galactic Longitude243.94 degrees
1997 Distance from Earth4.28 Parallax (milliarcseconds)
 762.06 Light Years
 233.64 Parsecs
2007 Revised Distance from Earth4.52 Parallax (milliarcseconds)
 721.60 Light Years
 221.24 Parsecs
Galacto-Centric Distance24,432.90 Light Years / 7,491.00 Parsecs
Proper Motion Dec.0.41 ± 0.14 milliarcseconds/year
Proper Motion RA.0.12 ± 0.16 milliarcseconds/year
B-V Index-0.09
Radial Velocity45.30 ± 1.78 km/s
Spectral TypeB8:IV
Colour(B) blue

Estimated Facts

Calculated Effective Temperature11,375 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Al Kurud in Columba

Al Kurud (Theta Columbae) Location in Columba

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

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