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HomeFactsConstellationsCanis Major

FY Canis Majoris, HD58978, HIP36168

FY Canis Majoris is a blue eruptive luminous giant star that can be located in the constellation of CanisMajor. 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.

FY Canis Majoris's Alternative Names

HIP36168 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD58978.

FY Canis Majoris has alternative name(s) :- , FY 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-22 1874.

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

Location of FY 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 FY Canis Majoris, the location is 07h 26m 59.49 and -23° 05` 09.7 .

Proper Motion of FY 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 4.82 ± 0.25 miliarcseconds/year towards the north and -7.76 ± 0.33 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 25.00000 km/s with an error of about 10.00 km/s .

FY 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 1,553.87 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of FY Canis Majoris

FY Canis Majoris has a spectral type of B1II. This means the star is a blue luminous giant star. The star is 7,608.00 Parsecs from the Galactic Centre or terms of Light Years is 24,814.51 s. The star has a B-V Colour Index of -0.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 15,544 Kelvin.

FY Canis Majoris Radius has been calculated as being 4.15 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,885,939.29.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 3.66. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FY Canis Majoris Apparent and Absolute Magnitudes

FY Canis Majoris has an apparent magnitude of 5.65 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 -2.54 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.27. 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 FY Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.30 which gave the calculated distance to FY Canis Majoris as 1418.10 light years away from Earth or 434.78 parsecs. It would take a spaceship travelling at the speed of light, 1418.10 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 2.61 which put FY Canis Majoris at a distance of 1249.67 light years or 383.14 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.

The star's Galacto-Centric Distance is 7,608.00 Parsecs or 24,814.51 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of FY 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. FY Canis Majoris brightness ranges from a magnitude of 5.637 to a magnitude of 5.528 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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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FY Canis Majoris Facts

Visual Facts


 FY Canis Majoris
Alternative NamesHD 58978, HIP 36168, BD-22 1874, FY CMa
Spectral TypeB1II
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
Colour blue
GalaxyMilky Way
ConstellationCanis Major
Absolute Magnitude-2.54 / -2.27
Visual / Apparent Magnitude5.65
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 26m 59.49
Declination (Dec.)-23° 05` 09.7
Galactic Latitude-3.00 degrees
Galactic Longitude237.41 degrees
1997 Distance from Earth2.30 Parallax (milliarcseconds)
 1418.10 Light Years
 434.78 Parsecs
2007 Distance from Earth2.61 Parallax (milliarcseconds)
 1249.67 Light Years
 383.14 Parsecs
Galacto-Centric Distance24,814.51 Light Years / 7,608.00 Parsecs
Proper Motion Dec.4.82 ± 0.25 milliarcseconds/year
Proper Motion RA.-7.76 ± 0.33 milliarcseconds/year
B-V Index-0.13
Radial Velocity25.00 ± 10.00 km/s
Eccentricity0.05
Semi-Major Axis7967.00
Stellar Luminosity (Lsun)1,553.87

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.088
Variable Magnitude Range (Brighter - Dimmer)5.528 - 5.637

Estimated Facts


Calculated Effective Temperature15,544 Kelvin

Sources and Links


SIMBAD SourceLink

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