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Omicron Canis Majoris, 16 Canis Majoris, HD50877, HIP33152, HR2580

Omicron Canis Majoris is a orange to red pulsating supergiant star that can be located in the constellation of Canis Major. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Omicron Canis Majoris's Alternative Names

Omicron Canis Majoris (Omi01 Cma) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2580. HIP33152 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD50877.

Omicron Canis Majoris has alternative name(s) :- , omi01 CMa.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 16 Canis Majoris with it shortened to 16 CMa.

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

Location of Omicron Canis Majoris

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For Omicron Canis Majoris, the location is 06h 54m 07.95 and -24° 11` 03.2 .

Proper Motion of Omicron 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 4.98 ± 0.30 miliarcseconds/year towards the north and -3.83 ± 0.43 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 34.52000 km/s with an error of about 1.66 km/s .

Physical Properties (Colour, Temperature) of Omicron Canis Majoris

Omicron Canis Majoris has a spectral type of K3Iab. This means the star is a orange to red supergiant star. The star has a B-V Colour Index of 1.74 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,298 Kelvin.

Omicron Canis Majoris Radius has been calculated as being 288.70 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 200,879,589.22.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 2170.17. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.10 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Omicron Canis Majoris Apparent and Absolute Magnitudes

Omicron Canis Majoris has an apparent magnitude of 3.89 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 -5.02 If you used the 2007 Parallax value, you would get an absolute magnitude of -9.40. 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 Omicron Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.65 which gave the calculated distance to Omicron Canis Majoris as 1976.75 light years away from Earth or 606.06 parsecs. It would take a spaceship travelling at the speed of light, 1976.75 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 0.22 which put Omicron Canis Majoris at a distance of 14825.61 light years or 4545.45 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 Omicron 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. Omicron Canis Majoris brightness ranges from a magnitude of 4.200 to a magnitude of 3.939 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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.

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Omicron Canis Majoris Facts

Visual Facts


Primary / Proper / Traditional NameOmicron Canis Majoris
Alternative NamesOmi01 Cma, HD 50877, HIP 33152, HR 2580, 16 Canis Majoris, 16 CMa, omi01 CMa
Spectral TypeK3Iab
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour orange to red
GalaxyMilky Way
ConstellationCanis Major
Absolute Magnitude-5.02 / -9.40
Visual / Apparent Magnitude3.89
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 54m 07.95
Declination (Dec.)-24° 11` 03.2
Galactic Latitude-10.21 degrees
Galactic Longitude234.98 degrees
1997 Distance from Earth1.65 Parallax (milliarcseconds)
 1976.75 Light Years
 606.06 Parsecs
2007 Distance from Earth0.22 Parallax (milliarcseconds)
 14825.61 Light Years
 4545.45 Parsecs
Proper Motion Dec.4.98 ± 0.30 milliarcseconds/year
Proper Motion RA.-3.83 ± 0.43 milliarcseconds/year
B-V Index1.74
Radial Velocity34.52 ± 1.66 km/s
Iron Abundance-0.10 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.239
Variable Magnitude Range (Brighter - Dimmer)3.939 - 4.200

Estimated Facts


Calculated Effective Temperature3,298 Kelvin

Sources and Links


SIMBAD SourceLink

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