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GN Draconis

GN Draconis Facts

GN Draconis's Alternative Names

HIP84896 is the reference name for the star in the Hipparcos Star Catalogue.

GN Draconis has alternative name(s) :- , GN 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+66 1014.

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

Location of GN 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 GN Draconis, the location is 17h 21m 01.28 and +66° 27` 21.9 .

Proper Motion of GN 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 11.79 ± 1.01 milliarcseconds/year towards the north and -10.25 ± 1.06 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 GN Draconis

GN Draconis Colour and Temperature

GN Draconis has a spectral type of M2. This means the star is a red variable star. The star has a B-V Colour Index of 1.69 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,492 Kelvin.

GN Draconis Apparent and Absolute Magnitudes

GN Draconis has an apparent magnitude of 9.37 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.96. 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 GN Draconis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.06 which gave the calculated distance to GN Draconis as -54360.56 light years away from Earth or -16666.67 parsecs. It would take a spaceship travelling at the speed of light, -54360.56 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 0.86 which put GN Draconis at a distance of 3792.60 light years or 1162.79 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 239,840,982.82 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.

Variable Type of GN 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. GN Draconis brightness ranges from a magnitude of 10.073 to a magnitude of 9.063 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.9 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 GN Draconis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameGN Draconis
Alternative NamesHIP 84896, BD+66 1014, GN Dra
Spectral TypeM2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationDraco
Absolute Magnitude / -0.96
Visual / Apparent Magnitude9.37
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)17h 21m 01.28
Declination (Dec.)+66° 27` 21.9
Galactic Latitude33.69 degrees
Galactic Longitude96.62 degrees
1997 Distance from Earth-0.06 Parallax (milliarcseconds)
 -54360.56 Light Years
 -16666.67 Parsecs
2007 Distance from Earth0.86 Parallax (milliarcseconds)
 3792.60 Light Years
 1162.79 Parsecs
 239,840,982.82 Astronomical Units
Proper Motion Dec.11.79 ± 1.01 milliarcseconds/year
Proper Motion RA.-10.25 ± 1.06 milliarcseconds/year
B-V Index1.69

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 Days0.904
Variable Magnitude Range (Brighter - Dimmer)9.063 - 10.073

Estimated Calculated Facts


Effective Temperature3,492 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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