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HomeFactsConstellationsCanis Major

EZ Canis Majoris, HD50896, HIP33165

EZ Canis Majoris is a eclipsing binary system star that can be located in the constellation of CanisMajor. The star can not be seen by the naked eye, you need a telescope to see it.

HIP33165 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD50896.

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

Location of EZ 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 EZ Canis Majoris, the location is 06h 54m 13.05 and -23d 55` 42.1 .

Wolf-Rayet Star

The star is a Wolf-Rayet, a rare type of star of which not many are known. These stars are extremely luminous and large compared to our Sun. They live fast and die hard in a matter of millions not billions of years like our Sun. They exhaust their hydrogen supplies, turning to other gasses and expand outwards with massive solar winds, moving a step closer in the stellar evolution towards their death in a super or hypernova explosion.

Proper Motion of EZ 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 4.35 ± 0.41 miliarcseconds/year towards the north and -3.76 ± 0.62 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 164.00000 km/s with an error of about 999.00 km/s .

Physical Properties (Temperature, Radius) of EZ Canis Majoris

EZ Canis Majoris has a spectral type of WN5 (SB1). This means the star is a star. The star has a B-V Colour Index of -0.05 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,775 Kelvin.

EZ Canis Majoris Radius has been calculated as being 6.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,202,300.51.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 14.56. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

EZ Canis Majoris Apparent and Absolute Magnitudes

EZ Canis Majoris has an apparent magnitude of 6.65 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 -2.15 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.06. 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 EZ Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.74 which gave the calculated distance to EZ Canis Majoris as 1874.50 light years away from Earth or 574.71 parsecs. It would take a spaceship travelling at the speed of light, 1874.50 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 0.72 which put EZ Canis Majoris at a distance of 4530.05 light years or 1388.89 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.

Variable Type of EZ Canis Majoris

The star is a eclipsing binary system Eruptive Wolf-Rayet 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. EZ Canis Majoris brightness ranges from a magnitude of 6.668 to a magnitude of 6.570 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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.

EZ Canis Majoris Facts

Alternative Names

Traditional/Proper NameEZ Canis Majoris
Short NameEZ CMa
Hipparcos Library I.D.33165
Henry Draper Designation50896
Wolf-Rayet Id6

Visual Facts

Star Type star
ConstellationCanis Major
Absolute Magnitude-2.15 / -4.06
Visual / Apparent Magnitude6.65
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 54m 13.05
Declination (Dec.)-23d 55` 42.1
Galactic Latitude-10.08 degrees
Galactic Longitude234.76 degrees
1997 Distance from Earth1.74 Parallax (milliarcseconds)
 1874.50 Light Years
 574.71 Parsecs
2007 Revised Distance from Earth0.72 Parallax (milliarcseconds)
 4530.05 Light Years
 1388.89 Parsecs
Proper Motion Dec.4.35 ± 0.41 milliarcseconds/year
Proper Motion RA.-3.76 ± 0.62 milliarcseconds/year
B-V Index-0.05
Radial Velocity164.00 ± 999.00 km/s
Spectral TypeWN5 (SB1)

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeEruptive Wolf-Rayet
Mean Variability Period in Days0.085
Variable Magnitude Range (Brighter - Dimmer)6.570 - 6.668

Estimated Facts

Calculated Effective Temperature11,775 Kelvin

Sources and Links

SIMBAD SourceLink

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