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FV Canis Majoris, HD54309, HIP34360

FV Canis Majoris is a blue eruptive main sequence dwarf star that can be located in the constellation of CanisMajor. FV Canis Majoris is the brightest star in Canis Major based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP34360 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD54309.

FV Canis Majoris has alternative name(s), FV CMa.

Location of FV 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 FV Canis Majoris, the location is 07h 07m 22.59 and -23d50`26.6 .

Proper Motion of FV 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 6.09 ± 0.54 miliarcseconds/year towards the north and -3.36 ± 0.64 miliarcseconds/year east if we saw them in the horizon.

FV 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 3190.0000000 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, Radius) of FV Canis Majoris

FV Canis Majoris has a spectral type of B2V:nn. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of -0.11 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,006 Kelvin.

FV Canis Majoris Radius has been calculated as being 13.87 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,652,300.08.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 32.52. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FV Canis Majoris Apparent and Absolute Magnitudes

FV Canis Majoris has an apparent magnitude of 5.75 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 -4.04 If you used the 2007 Parallax value, you would get an absolute magnitude of -5.89. 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 FV Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.10 which gave the calculated distance to FV Canis Majoris as 2965.12 light years away from Earth or 909.09 parsecs. It would take a spaceship travelling at the speed of light, 2965.12 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 0.47 which put FV Canis Majoris at a distance of 6939.65 light years or 2127.66 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 FV Canis Majoris

The star is a eruptive Gamma Cassiopeiae 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. FV Canis Majoris brightness ranges from a magnitude of 5.880 to a magnitude of 5.609 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.

FV Canis Majoris Facts

Alternative Names

Traditional/Proper NameFV Canis Majoris
Short NameFV CMa
Hipparcos Library I.D.34360
Henry Draper Designation54309

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-4.04 / -5.89
Visual / Apparent Magnitude5.75
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 07m 22.59
Declination (Dec.)-23d50`26.6
Galactic Latitude-7.34 degrees
Galactic Longitude236.01 degrees
1997 Distance from Earth1.10 Parallax (milliarcseconds)
 2965.12 Light Years
 909.09 Parsecs
2007 Revised Distance from Earth0.47 Parallax (milliarcseconds)
 6939.65 Light Years
 2127.66 Parsecs
Proper Motion Dec.6.09 ± 0.54 milliarcseconds/year
Proper Motion RA.-3.36 ± 0.64 milliarcseconds/year
B-V Index-0.11
Radial Velocity20.00 ± 7.50 km/s
Spectral TypeB2V:nn
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.232
Variable Magnitude Range (Brighter - Dimmer)5.609 - 5.880

Estimated Facts

Luminosity (x the Sun)3,190.0000000
Calculated Effective Temperature12,006 Kelvin

Sources and Links

SIMBAD SourceLink

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