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HomeFactsConstellationsCanis Major

Mu Canis Majoris, 18 Canis Majoris, HD51250, HIP33345, HR2593

Mu Canis Majoris is a blue main sequence dwarf star that can be located in the constellation of CanisMajor. Mu Canis Majoris is the brightest star in Canis Major based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Mu Canis Majoris is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2593. HIP33345 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD51250.

Location of Mu 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 Mu Canis Majoris, the location is 06h 56m 06.65 and -14d 02` 36.4 .

Proper Motion of Mu 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 6.33 ± 0.40 miliarcseconds/year towards the north and -1.59 ± 0.58 miliarcseconds/year east if we saw them in the horizon.

Mu 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 42.0000000 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 Mu Canis Majoris

Mu Canis Majoris has a spectral type of B9.5V. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of 1.18 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,524 Kelvin.

Mu Canis Majoris Radius has been calculated as being 42.26 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 29,401,157.77.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 58.06. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Mu Canis Majoris Apparent and Absolute Magnitudes

Mu Canis Majoris has an apparent magnitude of 5.00 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 -2.22 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.91. 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 Mu Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.59 which gave the calculated distance to Mu Canis Majoris as 908.53 light years away from Earth or 278.55 parsecs. It would take a spaceship travelling at the speed of light, 908.53 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 2.62 which put Mu Canis Majoris at a distance of 1244.90 light years or 381.68 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.

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.

Mu Canis Majoris Facts

Alternative Names

Flamsteed Name18 Canis Majoris
Flamsteed Short Name18 CMa
Bayer DesignationMu Canis Majoris
Hipparcos Library I.D.33345
Yale Bright Star Catalogue (HR) Id2593
Bonner DurchmusterungBD-13 1741
Henry Draper Designation51250

Visual Facts

Star Typemain sequence dwarf star
ConstellationCanis Major
Absolute Magnitude-2.22 / -2.91
Visual / Apparent Magnitude5.00
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 56m 06.65
Declination (Dec.)-14d 02` 36.4
Galactic Latitude-5.34 degrees
Galactic Longitude225.99 degrees
1997 Distance from Earth3.59 Parallax (milliarcseconds)
 908.53 Light Years
 278.55 Parsecs
2007 Revised Distance from Earth2.62 Parallax (milliarcseconds)
 1244.90 Light Years
 381.68 Parsecs
Proper Motion Dec.6.33 ± 0.40 milliarcseconds/year
Proper Motion RA.-1.59 ± 0.58 milliarcseconds/year
B-V Index1.18
Radial Velocity18.10 ± 0.10 km/s
Spectral TypeB9.5V
Colour(B) blue

Estimated Facts

Luminosity (x the Sun)42.0000000
Calculated Effective Temperature4,524 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
51250-13 1741.0A5.30000-13.0000072.00000G5Yellow

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