Universe Guide


Alpha Tucanae, HD211416, HIP110130

Alpha Tucanae is a orange to red giant star that can be located in the constellation of Tucana. Alpha Tucanae is the 1st brightest star in Tucana 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.

Alpha Tucanae is the Bayer Classification for the star. HIP110130 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD211416.

Location of Alpha Tucanae

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 Alpha Tucanae, the location is 22h 18m 30.18 and -60d15`34.2 .

Proper Motion of Alpha Tucanae

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 -39.44 ± 0.37 miliarcseconds/year towards the north and -70.72 ± 0.59 miliarcseconds/year east if we saw them in the horizon.

Alpha Tucanae Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 58.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Alpha Tucanae

Alpha Tucanae has a spectral type of K3III. This means the star is a orange to red giant star. The star is 7365.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24021.9302856000000000s. The star has a B-V Colour Index of 1.39 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,176 Kelvin.

Alpha Tucanae Radius has been calculated as being 28.93 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,131,547.43.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 29.20. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Alpha Tucanae Apparent and Absolute Magnitudes

Alpha Tucanae has an apparent magnitude of 2.87 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 -1.05 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.07. 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 Alpha Tucanae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.42 which gave the calculated distance to Alpha Tucanae as 198.64 light years away from Earth or 60.90 parsecs. It would take a spaceship travelling at the speed of light, 198.64 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 16.33 which put Alpha Tucanae at a distance of 199.73 light years or 61.24 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 7,365.00 Parsecs or 24,021.93 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.

Alpha Tucanae Facts

Alternative Names

Bayer DesignationAlpha Tucanae
Hipparcos Library I.D.110130
Henry Draper Designation211416

Visual Facts

Star Typegiant star
Absolute Magnitude-1.05 / -1.07
Visual / Apparent Magnitude2.87
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 18m 30.18
Declination (Dec.)-60d15`34.2
Galactic Latitude-47.96 degrees
Galactic Longitude330.22 degrees
1997 Distance from Earth16.42 Parallax (milliarcseconds)
 198.64 Light Years
 60.90 Parsecs
2007 Revised Distance from Earth16.33 Parallax (milliarcseconds)
 199.73 Light Years
 61.24 Parsecs
Galacto-Centric Distance24,021.93 Light Years / 7,365.00 Parsecs
Proper Motion Dec.-39.44 ± 0.37 milliarcseconds/year
Proper Motion RA.-70.72 ± 0.59 milliarcseconds/year
B-V Index1.39
Radial Velocity42.20 ± 3.70 km/s
Semi-Major Axis32.34
Orbital Period (Days)4198.00
Argument Of Periastron76.00
Spectral TypeK3III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)58.0000000
Calculated Effective Temperature4,176 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Alpha Tucanae in Tucana

Alpha Tucanae (Alpha Tucanae) Location in Tucana

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

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