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GX Draconis

GX Draconis Facts

GX Draconis's Alternative Names

HIP88411 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD234545.

GX Draconis has alternative name(s) :- , GX Dra.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+50 2513.

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

Location of GX Draconis

The location of the variable star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For GX Draconis, the location is 18h 03m 06.35 and +50° 41` 48.3 .

Proper Motion of GX 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 7.25 ± 0.53 milliarcseconds/year towards the north and -17.73 ± 0.59 milliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of GX Draconis

GX Draconis Colour and Temperature

GX Draconis has a spectral type of K0. This means the star is a orange to red variable star. 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 4,227 Kelvin.

GX Draconis Radius

Radius has been calculated as being 22.85 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 15,897,510.73.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 36.55. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

GX Draconis Apparent and Absolute Magnitudes

GX Draconis has an apparent magnitude of 8.26 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 -0.59 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.61. 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 GX Draconis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.70 which gave the calculated distance to GX Draconis as 1918 light years away from Earth or 588 parsecs. If you want that in miles, it is 1,286,242,694,422.

In 2007, Hipparcos data was revised with a new parallax of 1.06 which put GX Draconis at a distance of 3077 light years or 943 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.

Using the 2007 distance, the star is roughly 194,506,356.95 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to GX Draconis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4515,871,841,858.00
Car12017,195,728,061.00
Airbus A3807362,803,651,314.00
Speed of Sound (Mach 1)767.2692,689,392,334.00
Concorde (Mach 2)1,534.541,344,694,414.00
New Horizons Probe33,00062,529,920.00
Speed of Light670,616,629.003,077.00

Variable Type of GX Draconis

The star is a pulsating Semi-Regular Star w 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. GX Draconis brightness ranges from a magnitude of 8.568 to a magnitude of 8.322 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 days (variability).

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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Additional GX Draconis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameGX Draconis
Alternative NamesHD 234545, HIP 88411, BD+50 2513, GX Dra
Spectral TypeK0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourOrange to Red
GalaxyMilky Way
ConstellationDraco
Absolute Magnitude -0.59 / -1.61
Visual / Apparent Magnitude8.26
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 03m 06.35
Declination (Dec.)+50° 41` 48.3
Galactic Latitude28.09 degrees
Galactic Longitude78.34 degrees
1997 Distance from Earth1.70 Parallax (milliarcseconds)
 1918 Light Years
 588 Parsecs
2007 Distance from Earth1.06 Parallax (milliarcseconds)
 3077 Light Years
 943 Parsecs
 194,506,356.95 Astronomical Units
Proper Motion Dec.7.25 ± 0.53 milliarcseconds/year
Proper Motion RA.-17.73 ± 0.59 milliarcseconds/year
B-V Index1.39

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.213
Variable Magnitude Range (Brighter - Dimmer)8.322 - 8.568

Estimated Calculated Facts


Radius (x the Sun)36.55
Effective Temperature4,227 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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