Universe Guide

12 Canis Majoris - HD49333 - HIP32504

12 Canis Majoris is a blue rotating giant star that can be located in the constellation of CanisMajor. HIP32504 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD49333. 12 Canis Majoris has alternative name(s), 12 Canis Majoris , HK_CMa, 12 CMa.

Location of 12 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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 12 Canis Majoris, the location is 06h 47m 01.49 and -21 d 00 ` 55.5 .

Proper Motion of 12 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 005.00 ± 000.00 towards the north and -015.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 12 Canis Majoris

12 Canis Majoris has a spectral type of B7II/III. This means the star is a blue coloured giant star. The star has a B-V Colour Index of -0.15 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 13,674 Kelvin.

12 Canis Majoris has been calculated as 2.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,417,754.38.km.

12 Canis Majoris Apparent and Absolute Magnitudes

12 Canis Majoris has an apparent magnitude of 6.07 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 -0.44 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.92. 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 12 Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.00 which gave the calculated distance to 12 Canis Majoris as 652.33 light years away from us or 200 parsecs. In 2007, Hipparcos data was revised with a new parallax of 4.00 which put 12 Canis Majoris at a distance of 815.41 light years or 250 parsecs.

Variable Type of 12 Canis Majoris

The star is a rotating Alpha2 Canum Venaticorum 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. 12 Canis Majoris brightness ranges from a magnitude of 6.000 to a magnitude of 6.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.0 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

12 Canis Majoris Facts


Traditional Name12 Canis Majoris
Short NameHK CMa, 12 CMa
Alternative Name(s)12 Canis Majoris
Hipparcos Library I.D.32504
Henry Draper Designation49333
Celestial TypeStar
Absolute Magnitude-0.44 / -0.92
Apparent Magnitude6.07
Right Ascension (R.A.)06h 47m 01.49
Declination (Dec.)-21 d 00 ` 55.5
1997 Distance5.00 Parallax (milliarcseconds)
 652.33 Light Years
 200 Parsecs
2007 Distance4.00 Parallax (milliarcseconds)
 815.41 Light Years
 250 Parsecs
Proper Motion Dec.5.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-15.00 ± 1.00 milliarcseconds/year
B-V Index-0.15
Spectral TypeB7II/III
Colour(B) blue
Star Typegiant star
Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days2.000
Radius (x the Sun)2.04
Calculated Effective Temperature13,674 Kelvin


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