Universe Guide

FM Canis Majoris

FM Canis Majoris Facts

FM Canis Majoris's Alternative Names

HIP34221 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD53756.

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

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-12 1777.

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

Location of FM Canis Majoris

The location of the luminous giant 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 object is compared to the celestial equator and is expressed in degrees. For FM Canis Majoris, the location is 07h 05m 42.09 and -12° 48` 42.6 .

Radial Velocity and Proper Motion of FM Canis Majoris

Proper Motion

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 2.03 ± 0.42 milliarcseconds/year towards the north and -4.34 ± 0.59 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 19.00 km/s with an error of about 7.40 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of FM Canis Majoris

FM Canis Majoris Colour and Temperature

FM Canis Majoris has a spectral type of B2/B3II. This means the star is a blue luminous giant star. The star has a B-V Colour Index of -0.11 which means the star's temperature is about 14,384 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

FM Canis Majoris Radius

Radius has been calculated as being 10.65 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,407,475.20.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 43.37. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FM Canis Majoris Apparent and Absolute Magnitudes

FM Canis Majoris has an apparent magnitude of 7.30 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 -4.25 If you used the 2007 Parallax value, you would get an absolute magnitude of -7.30. 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 FM Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.49 which gave the calculated distance to FM Canis Majoris as 6656.39 light years away from Earth or 2040.82 parsecs. If you want that in miles, it is 4,463,885,823,109.

In 2007, Hipparcos data was revised with a new parallax of 0.12 which put FM Canis Majoris at a distance of 27180.28 light years or 8333.33 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.

Using the 2007 distance, the star is roughly 1,718,860,720.66 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to FM Canis Majoris

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A38073624,765,689,876.19
Speed of Sound (Mach 1)767.26923,756,398,015.40
Concorde (Mach 2)1,534.5411,878,183,526.58
New Horizons Probe33,000552,349,931.78
Speed of Light670,616,629.0027,180.28

Variable Type of FM Canis Majoris

The star is a eclipsing binary sys Beta Persei (Algol) 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. FM Canis Majoris brightness ranges from a magnitude of 7.505 to a magnitude of 7.260 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.8 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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Additional FM Canis Majoris Facts and Figures

Visual Facts

Primary / Proper / Traditional NameFM Canis Majoris
Alternative NamesFM CMa, HD 53756, HIP 34221, BD-12 1777, FM CMa
Spectral TypeB2/B3II
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
GalaxyMilky Way
ConstellationCanis Major
Absolute Magnitude -4.25 / -7.30
Visual / Apparent Magnitude7.30
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)07h 05m 42.09
Declination (Dec.)-12° 48` 42.6
Galactic Latitude-2.70 degrees
Galactic Longitude225.95 degrees
1997 Distance from Earth0.49 Parallax (milliarcseconds)
 6656.39 Light Years
 2040.82 Parsecs
2007 Distance from Earth0.12 Parallax (milliarcseconds)
 27180.28 Light Years
 8333.33 Parsecs
 1,718,860,720.66 Astronomical Units
Proper Motion Dec.2.03 ± 0.42 milliarcseconds/year
Proper Motion RA.-4.34 ± 0.59 milliarcseconds/year
B-V Index-0.11
Radial Velocity19.00 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Persei (Algol)
Mean Variability Period in Days2.789
Variable Magnitude Range (Brighter - Dimmer)7.260 - 7.505

Estimated Calculated Facts

Radius (x the Sun)43.37
Effective Temperature14,384 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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