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FF Canis Majoris

FF Canis Majoris Facts

  • FF Canis Majoris is a eclipsing main sequence star that can be located in the constellation of Canis Major. The description is based on the spectral class.
  • FF Canis Majoris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B3/5V(p)) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 4026.71 light years away from us. Distance

FF Canis Majoris's Alternative Names

HIP34646 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD55173.

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

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

Location of FF Canis Majoris

The location of the main sequence 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 FF Canis Majoris, the location is 07h 10m 30.63 and -30° 39` 45.0 .

Proper Motion of FF 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 5.55 ± 0.93 milliarcseconds/year towards the north and -1.27 ± 0.91 milliarcseconds/year east if we saw them in the horizon. . 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 of FF Canis Majoris

FF Canis Majoris Temperature and Colour

Based on the star's spectral type of B3/5V(p) , FF Canis Majoris's colour and type is blue main sequence star. The star has a B-V Colour Index of -0.17 which means the star's temperature is about 14,786 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

FF Canis Majoris Radius

FF Canis Majoris Apparent and Absolute Magnitudes

FF Canis Majoris has an apparent magnitude of 7.58 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 -2.88. 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 FF Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.34000 which gave the calculated distance to FF Canis Majoris as -2434.05 light years away from Earth or -746.27 parsecs. If you want that in miles, it is about -14,308,868,089,597,565.92, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.81000 which put FF Canis Majoris at a distance of 4026.71 light years or 1234.57 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 254,646,567.45 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 FF 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)
Walking4675,094,671,540.15
Car12022,503,155,718.00
Airbus A3807363,668,992,780.11
Speed of Sound (Mach 1)767.2693,519,467,991.23
Concorde (Mach 2)1,534.541,759,731,702.11
New Horizons Probe33,00081,829,657.16
Speed of Light670,616,629.004,026.71

Variable Type of FF Canis Majoris

The star is a eclipsing Beta Lyrae (Sheliak) 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. FF Canis Majoris brightness ranges from a magnitude of 7.718 to a magnitude of 7.331 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.2 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.

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Additional FF Canis Majoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameFF Canis Majoris
Alternative NamesFF CMa, HD 55173, HIP 34646, FF CMa
Spectral TypeB3/5V(p)
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationCanis Major
Absolute Magnitude / -2.88
Visual / Apparent Magnitude7.58
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)07h 10m 30.63
Declination (Dec.)-30° 39` 45.0
Galactic Latitude-9.72426440 degrees
Galactic Longitude242.50752953 degrees
1997 Distance from Earth-1.34000 Parallax (milliarcseconds)
 -2434.05 Light Years
 -746.27 Parsecs
2007 Distance from Earth0.81000 Parallax (milliarcseconds)
 4026.71 Light Years
 1234.57 Parsecs
 254,646,567.45 Astronomical Units
Proper Motion Dec.5.55000 ± 0.93000 milliarcseconds/year
Proper Motion RA.-1.27000 ± 0.91000 milliarcseconds/year
B-V Index-0.17

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days1.213
Variable Magnitude Range (Brighter - Dimmer)7.331 - 7.718

Estimated Calculated Facts


Effective Temperature14,786 Kelvin

Sources and Links


SIMBAD SourceLink

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