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Mu Canis Majoris (18 Canis Majoris) Star Facts

Mu Canis Majoris Facts

Mu Canis Majoris's Alternative Names

Mu Canis Majoris (Mu. Cma) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

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.

Mu Canis Majoris has alternative name(s) :- Mu CMa.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 18 Canis Majoris. The Flamsteed name can be shortened to 18 CMa.

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-13 1741.

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

Location of Mu Canis Majoris

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

Radial Velocity and Proper Motion of Mu Canis Majoris

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 6.33 ± 0.40 milliarcseconds/year towards the north and -1.59 ± 0.58 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 18.10 km/s with an error of about 0.10 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 (Colour, Temperature) of Mu Canis Majoris

Mu Canis Majoris Colour and Temperature

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

Mu Canis Majoris Radius

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. 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 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. If you want that in miles, it is 609,275,325,945.

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.

Using the 2007 distance, the star is roughly 78,726,602.67 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.

Travel Time to Mu Canis Majoris

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)
Walking4208,712,660,360.53
Car1206,957,088,678.68
Airbus A3807361,134,307,936.74
Speed of Sound (Mach 1)767.2691,088,080,766.25
Concorde (Mach 2)1,534.54544,039,674.07
New Horizons Probe33,00025,298,504.29
Speed of Light670,616,629.001,244.90

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 Mu Canis Majoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameMu Canis Majoris
Alternative NamesMu. Cma, Mu CMa, HIP 33345, HR 2593, 18 Canis Majoris, 18 CMa, BD-13 1741
Spectral TypeB9.5V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
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.)-14° 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 Distance from Earth2.62 Parallax (milliarcseconds)
 1244.90 Light Years
 381.68 Parsecs
 78,726,602.67 Astronomical Units
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

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)58.06
Effective Temperature4,524 Kelvin

Sources and Links


SIMBAD SourceLink

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
B8.600001831
C10.500001865
D10.700001865

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