Universe Guide
AliensAliensConstellationsTelevision and Films ListFact ListGames ListWarcraftSearchTwitterFacebook


Tau Draconis, 60 Draconis, HD181984, HIP94648, HR7352

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

Tau Draconis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR7352. HIP94648 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD181984.

Location of Tau Draconis

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 Tau Draconis, the location is 19h 15m 33.29 and +73d 21` 18.8 .

Proper Motion of Tau Draconis

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 103.23 ± 0.48 miliarcseconds/year towards the north and -115.29 ± 0.50 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 -33.70000 km/s with an error of about 0.23 km/s .

Tau Draconis 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 Tau Draconis

Tau Draconis has a spectral type of K3III. This means the star is a orange to red star. The star is 7411.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24171.9654238400000000s. The star has a B-V Colour Index of 1.25 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,405 Kelvin.

Tau Draconis Radius has been calculated as being 9.48 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,599,101.57.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.27. 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 0.20 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Tau Draconis Apparent and Absolute Magnitudes

Tau Draconis has an apparent magnitude of 4.45 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 1.14 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.19. 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 Tau Draconis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 21.73 which gave the calculated distance to Tau Draconis as 150.10 light years away from Earth or 46.02 parsecs. It would take a spaceship travelling at the speed of light, 150.10 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 22.28 which put Tau Draconis at a distance of 146.39 light years or 44.88 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 7,411.00 Parsecs or 24,171.97 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.

Tau Draconis Facts

Alternative Names

Flamsteed Name60 Draconis
Flamsteed Short Name60 Dra
Bayer DesignationTau Draconis
Hipparcos Library I.D.94648
Yale Bright Star Catalogue (HR) Id7352
Bonner DurchmusterungBD+73 857
Henry Draper Designation181984

Visual Facts

Star Type star
Absolute Magnitude1.14 / 1.19
Visual / Apparent Magnitude4.45
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 15m 33.29
Declination (Dec.)+73d 21` 18.8
Galactic Latitude24.21 degrees
Galactic Longitude104.73 degrees
1997 Distance from Earth21.73 Parallax (milliarcseconds)
 150.10 Light Years
 46.02 Parsecs
2007 Revised Distance from Earth22.28 Parallax (milliarcseconds)
 146.39 Light Years
 44.88 Parsecs
Galacto-Centric Distance24,171.97 Light Years / 7,411.00 Parsecs
Proper Motion Dec.103.23 ± 0.48 milliarcseconds/year
Proper Motion RA.-115.29 ± 0.50 milliarcseconds/year
B-V Index1.25
Radial Velocity-33.70 ± 0.23 km/s
Iron Abundance0.20 ± 9.99 Fe/H
Spectral TypeK3III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)58.0000000
Calculated Effective Temperature4,405 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Add a Comment

Email: (Optional)