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Theta Doradus, HD34649, HIP24372, HR1744

Theta Doradus is a orange to red giant star that can be located in the constellation of Dorado. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Theta Doradus's Alternative Names

Theta Doradus is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR1744. HIP24372 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD34649.

More details on star alternative names can be found at Star Names.

Location of Theta Doradus

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 Theta Doradus, the location is 05h 13m 45.43 and -67° 11` 07.3 .

Proper Motion of Theta Doradus

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 37.55 ± 0.15 miliarcseconds/year towards the north and 19.19 ± 0.15 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 10.50000 km/s with an error of about 0.80 km/s .

Theta Doradus 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 442.5200000 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Theta Doradus

Theta Doradus has a spectral type of K2III. This means the star is a orange to red giant star. The star is 7385.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24087.1629544000000000s. The star has a B-V Colour Index of 1.27 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,372 Kelvin.

Theta Doradus Radius has been calculated as being 29.75 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,703,338.58.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 26.76. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Theta Doradus Apparent and Absolute Magnitudes

Theta Doradus has an apparent magnitude of 4.81 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 -1.31 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.08. 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 Theta Doradus

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.97 which gave the calculated distance to Theta Doradus as 546.34 light years away from Earth or 167.50 parsecs. It would take a spaceship travelling at the speed of light, 546.34 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 6.64 which put Theta Doradus at a distance of 491.21 light years or 150.60 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 7,385.00 Parsecs or 24,087.16 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.

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Theta Doradus Facts

Visual Facts

Alternative NamesHD 34649, HIP 24372, HR 1744
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-1.31 / -1.08
Visual / Apparent Magnitude4.81
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 13m 45.43
Declination (Dec.)-67° 11` 07.3
Galactic Latitude-34.26 degrees
Galactic Longitude277.64 degrees
1997 Distance from Earth5.97 Parallax (milliarcseconds)
 546.34 Light Years
 167.50 Parsecs
2007 Revised Distance from Earth6.64 Parallax (milliarcseconds)
 491.21 Light Years
 150.60 Parsecs
Galacto-Centric Distance24,087.16 Light Years / 7,385.00 Parsecs
Proper Motion Dec.37.55 ± 0.15 milliarcseconds/year
Proper Motion RA.19.19 ± 0.15 milliarcseconds/year
B-V Index1.27
Radial Velocity10.50 ± 0.80 km/s
Semi-Major Axis7234.00
Stellar Luminosity (Lsun)442.52
Spectral TypeK2III
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,372 Kelvin

Sources and Links

SIMBAD SourceLink

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