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HomeFactsConstellationsCanis Major

KX Canis Majoris, HD50648, HIP33040

KX Canis Majoris is a red pulsating giant star that can be located in the constellation of CanisMajor. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP33040 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD50648.

KX Canis Majoris has alternative name(s), KX CMa.

Location of KX Canis Majoris

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 KX Canis Majoris, the location is 06h 53m 00.31 and -26d 57` 26.9 .

Proper Motion of KX Canis Majoris

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 -65.96 ± 0.32 miliarcseconds/year towards the north and -9.90 ± 0.46 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 -12.90000 km/s with an error of about 0.40 km/s .

KX Canis Majoris 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 3.0000000 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 KX Canis Majoris

KX Canis Majoris has a spectral type of M6III. This means the star is a red giant star. The star is 7548.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24618.8092051200000000s. The star has a B-V Colour Index of 1.4 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,159 Kelvin.

KX Canis Majoris Radius has been calculated as being 24.83 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 17,274,952.49.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 27.22. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

KX Canis Majoris Apparent and Absolute Magnitudes

KX Canis Majoris has an apparent magnitude of 6.33 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 -0.70 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.90. 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 KX Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.93 which gave the calculated distance to KX Canis Majoris as 829.93 light years away from Earth or 254.45 parsecs. It would take a spaceship travelling at the speed of light, 829.93 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 3.58 which put KX Canis Majoris at a distance of 911.07 light years or 279.33 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 7,548.00 Parsecs or 24,618.81 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of KX Canis Majoris

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. KX Canis Majoris brightness ranges from a magnitude of 6.368 to a magnitude of 6.067 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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.

KX Canis Majoris Facts

Alternative Names

Traditional/Proper NameKX Canis Majoris
Short NameKX CMa
Hipparcos Library I.D.33040
Henry Draper Designation50648

Visual Facts

Star Typegiant star
ConstellationCanis Major
Absolute Magnitude-0.70 / -0.90
Visual / Apparent Magnitude6.33
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 53m 00.31
Declination (Dec.)-26d 57` 26.9
Galactic Latitude-11.61 degrees
Galactic Longitude237.43 degrees
1997 Distance from Earth3.93 Parallax (milliarcseconds)
 829.93 Light Years
 254.45 Parsecs
2007 Revised Distance from Earth3.58 Parallax (milliarcseconds)
 911.07 Light Years
 279.33 Parsecs
Galacto-Centric Distance24,618.81 Light Years / 7,548.00 Parsecs
Proper Motion Dec.-65.96 ± 0.32 milliarcseconds/year
Proper Motion RA.-9.90 ± 0.46 milliarcseconds/year
B-V Index1.40
Radial Velocity-12.90 ± 0.40 km/s
Spectral TypeM6III
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.271
Variable Magnitude Range (Brighter - Dimmer)6.067 - 6.368

Estimated Facts

Luminosity (x the Sun)3.0000000
Calculated Effective Temperature4,159 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
50648-26 3529.2A6.50000-32.00000-64.00000M4Red

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