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OS Canis Majoris, HD54764, HIP34561

OS Canis Majoris is a blue luminous giant 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.

OS Canis Majoris's Alternative Names

HIP34561 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD54764.

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-16 1802.

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

Location of OS 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 OS Canis Majoris, the location is 07h 09m 33.37 and -16 ° 14` 04.2 .

Proper Motion of OS 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 0.54 ± 0.25 miliarcseconds/year towards the north and -2.55 ± 0.36 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 6.40000 km/s with an error of about 2.90 km/s .

Physical Properties (Colour, Temperature) of OS Canis Majoris

OS Canis Majoris has a spectral type of B1Ib/II. This means the star is a blue luminous giant star. The star has a B-V Colour Index of 0.04 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,410 Kelvin.

OS Canis Majoris Apparent and Absolute Magnitudes

OS Canis Majoris has an apparent magnitude of 6.00 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.18. 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 OS Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.00 which gave the calculated distance to OS Canis Majoris as -1 light years away from Earth or -1 parsecs. It would take a spaceship travelling at the speed of light, -1 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 1.46 which put OS Canis Majoris at a distance of 2234.00 light years or 684.93 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. OS Canis Majoris brightness ranges from a magnitude of 6.073 to a magnitude of 6.036 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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OS Canis Majoris Facts

Visual Facts


Primary / Proper / Traditional NameOS Canis Majoris
Alternative NamesHD 54764, HIP 34561, BD-16 1802
Spectral TypeB1Ib/II
Multiple Star SystemYes
Star TypeLuminous Giant Star
Colour blue
GalaxyMilky Way
ConstellationCanis Major
Visual / Apparent Magnitude6.00
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 09m 33.37
Declination (Dec.)-16 ° 14` 04.2
Galactic Latitude-3.44 degrees
Galactic Longitude229.42 degrees
1997 Distance from Earth0.00 Parallax (milliarcseconds)
 -1 Light Years
 -1 Parsecs
2007 Distance from Earth1.46 Parallax (milliarcseconds)
 2234.00 Light Years
 684.93 Parsecs
Proper Motion Dec.0.54 ± 0.25 milliarcseconds/year
Proper Motion RA.-2.55 ± 0.36 milliarcseconds/year
B-V Index0.04
Radial Velocity6.40 ± 2.90 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.029
Variable Magnitude Range (Brighter - Dimmer)6.036 - 6.073

Estimated Facts


Calculated Effective Temperature9,410 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
54764-16 1802.0A6.00000-25.00000-11.00000B3Blue/White
B11.30000-17.00000-24.000001915

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