Universe Guide

10 Draconis - HD121130 - HIP67627

10 Draconis is a red pulsating giant star that can be located in the constellation of Draco. HIP67627 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD121130. 10 Draconis has alternative name(s), 10 Draconis , CU_Dra, 10 Dra.

Location of 10 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 10 Draconis, the location is 13h 51m 25.94 and +64 d 43 ` 23.8 .

Proper Motion of 10 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 -005.00 ± 000.00 towards the north and 001.00 ± 000.00 east if we saw them in the horizon.

10 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 10.0000000 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 10 Draconis

10 Draconis has a spectral type of M3III. This means the star is a red coloured giant star. The star has a B-V Colour Index of 1.57 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,850 Kelvin.

10 Draconis has been calculated as 31.77 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 22,104,220.64.km.

10 Draconis Apparent and Absolute Magnitudes

10 Draconis has an apparent magnitude of 4.58 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 -0.90 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.65. 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 10 Draconis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.00 which gave the calculated distance to 10 Draconis as 407.70 light years away from Earth or 125 parsecs. In 2007, Hipparcos data was revised with a new parallax of 9.00 which put 10 Draconis at a distance of 362.40 light years or 111.11 parsecs.

It would take a spaceship travelling at the speed of light, 407.70 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of 10 Draconis

The star is a pulsating Slow Irregular variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. 10 Draconis brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

10 Draconis Facts


Traditional Name10 Draconis
Short NameCU Dra, 10 Dra
Alternative Name(s)10 Draconis
Hipparcos Library I.D.67627
Bonner DurchmusterungBD+65 963
Henry Draper Designation121130
Celestial TypeStar
Absolute Magnitude-0.90 / -0.65
Apparent Magnitude4.58
Right Ascension (R.A.)13h 51m 25.94
Declination (Dec.)+64 d 43 ` 23.8
1997 Distance from Earth8.00 Parallax (milliarcseconds)
 407.70 Light Years
 125 Parsecs
2007 Distance from Earth9.00 Parallax (milliarcseconds)
 362.40 Light Years
 111.11 Parsecs
Proper Motion Dec.-5.00 ± 0.00 milliarcseconds/year
Proper Motion RA.1.00 ± 0.00 milliarcseconds/year
B-V Index1.57
Spectral TypeM3III
Colour(M) Red
Star Typegiant star
Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Radius (x the Sun)31.77
Luminosity (x the Sun)10.0000000
Calculated Effective Temperature3,850 Kelvin


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