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CX Draconis

CX Draconis Facts

  • CX Draconis is a eruptive main sequence star that can be located in the constellation of Draco. The description is based on the spectral class.
  • CX Draconis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B2.5V) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 1294.30 light years away from us. Distance

CX Draconis's Alternative Names

HIP92133 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD174237.

CX Draconis has alternative name(s) :- , CX 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+52 2280.

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

Location of CX Draconis

The location of the main sequence 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 CX Draconis, the location is 18h 46m 43.08 and +52° 59` 16.7 .

Radial Velocity and Proper Motion of CX Draconis

Proper Motion

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 -3.37 ± 0.20 milliarcseconds/year towards the north and 10.65 ± 0.24 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -2.10000 km/s with an error of about 2.30 km/s . 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 of CX Draconis

CX Draconis Colour and Temperature

Based on the star's spectral type of B2.5V , CX Draconis's colour and type is blue main sequence star. The star has a B-V Colour Index of -0.09 which means the star's temperature is about 11,375 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

CX 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 1,003.22 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

CX Draconis Radius

CX Draconis estimated radius has been calculated as being 10.54 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,336,966.46.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 6.2664418740632054059742806272. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

CX Draconis Apparent and Absolute Magnitudes

CX Draconis has an apparent magnitude of 5.91 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 -3.21 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.08. 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 CX Draconis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.50000 which gave the calculated distance to CX Draconis as 2174.42 light years away from Earth or 666.67 parsecs. If you want that in miles, it is about 12,782,600,583,957,905.26, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 2.52000 which put CX Draconis at a distance of 1294.30 light years or 396.83 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 81,851,492.71 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. The star's Galacto-Centric Distance is 7,363.00 Parsecs or 24,015.41 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to CX 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)
Walking4216,994,775,728.68
Car1207,233,159,190.96
Airbus A3807361,179,319,433.31
Speed of Sound (Mach 1)767.2691,131,257,880.76
Concorde (Mach 2)1,534.54565,628,203.18
New Horizons Probe33,00026,302,397.06
Speed of Light670,616,629.001,294.30

Variable Type of CX Draconis

The star is a eruptive Gamma Cassiopeiae 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. CX Draconis brightness ranges from a magnitude of 5.942 to a magnitude of 5.767 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 CX Draconis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCX Draconis
Alternative NamesHD 174237, HIP 92133, BD+52 2280, CX Dra
Spectral TypeB2.5V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationDraco
Absolute Magnitude -3.21 / -2.08
Visual / Apparent Magnitude5.91
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 46m 43.08
Declination (Dec.)+52° 59` 16.7
Galactic Latitude22.03297692 degrees
Galactic Longitude82.44513444 degrees
1997 Distance from Earth1.50000 Parallax (milliarcseconds)
 2174.42 Light Years
 666.67 Parsecs
2007 Distance from Earth2.52000 Parallax (milliarcseconds)
 1294.30 Light Years
 396.83 Parsecs
 81,851,492.71 Astronomical Units
Galacto-Centric Distance24,015.41 Light Years / 7,363.00 Parsecs
Proper Motion Dec.-3.37000 ± 0.20000 milliarcseconds/year
Proper Motion RA.10.65000 ± 0.24000 milliarcseconds/year
B-V Index-0.09
Radial Velocity-2.10000 ± 2.30 km/s
Eccentricity0.20620
Semi-Major Axis9067.0000000
Stellar Luminosity (Lsun)1003.2200000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.172
Variable Magnitude Range (Brighter - Dimmer)5.767 - 5.942

Estimated Calculated Facts


Radius (x the Sun)6.27
Effective Temperature11,375 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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