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Nu2 Canis Majoris - HD47205 - HIP31592

Nu2 Canis Majoris is a orange to red giant star that can be located in the constellation of CanisMajor. Nu2 Canis Majoris is the Bayer Classification for the star. HIP31592 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD47205. Nu2 Canis Majoris has alternative name(s), 7 Canis Majoris , 7 CMa. Nu2 Canis Majoris has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of Nu2 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 Nu2 Canis Majoris, the location is 06h 36m 41.00 and -19d15`20.6 .

Proper Motion of Nu2 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 -069.97 ± 000.13 towards the north and 062.57 ± 000.23 east if we saw them in the horizon.

Nu2 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 82.0000000 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, Metallicity, Mass, Radius) of Nu2 Canis Majoris

Nu2 Canis Majoris has a spectral type of K1III+.... This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,792 Kelvin.

Nu2 Canis Majoris has been calculated as 4.36 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,036,197.79.km. The star's solar mass is 2.00 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.210000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

Nu2 Canis Majoris Apparent and Absolute Magnitudes

Nu2 Canis Majoris has an apparent magnitude of 3.95 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 2.46 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.47. 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 Nu2 Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 50.41 which gave the calculated distance to Nu2 Canis Majoris as 64.70 light years away from Earth or 19.84 parsecs. It would take a spaceship travelling at the speed of light, 64.70 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 50.63 which put Nu2 Canis Majoris at a distance of 64.42 light years or 19.75 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Nu2 Canis Majoris Facts

Alternative Names

Short Name7 CMa
Bayer DesignationNu2 Canis Majoris
Alternative Name(s)7 Canis Majoris
Hipparcos Library I.D.31592
Bonner DurchmusterungBD-19 1502
Henry Draper Designation47205

Visual Facts

Star Typegiant star
Metalicity0.2100
Absolute Magnitude2.46 / 2.47
Apparent Magnitude3.95
Right Ascension (R.A.)06h 36m 41.00
Declination (Dec.)-19d15`20.6
1997 Distance from Earth50.41 Parallax (milliarcseconds)
 64.70 Light Years
 19.84 Parsecs
2007 Revised Distance from Earth50.63 Parallax (milliarcseconds)
 64.42 Light Years
 19.75 Parsecs
Proper Motion Dec.-69.97 ± 0.13 milliarcseconds/year
Proper Motion RA.62.57 ± 0.23 milliarcseconds/year
B-V Index1.03
Spectral TypeK1III+...
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Radius (x the Sun)4.36
Luminosity (x the Sun)82.0000000
Calculated Effective Temperature4,792 Kelvin
Mass Compared to the Sun2.00
Metallicity0.21000

Sources and Links

SIMBAD SourceLink

Related Stars


List of Extrasolar Planets orbiting Nu2 Canis Majoris


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
7 Cma BConfirmed2.46796.0000.2220111.9377.000

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