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FU Cancri

FU Cancri Facts

FU Cancri's Alternative Names

HIP42921 is the reference name for the star in the Hipparcos Star Catalogue.

FU Cancri has alternative name(s) :- , FU Cnc.

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+08 2112.

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

Location of FU Cancri

The location of the variable 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 FU Cancri, the location is 08h 44m 50.33 and +07° 37` 17.4 .

Physical Properties (Colour, Temperature) of FU Cancri

FU Cancri has a spectral type of M0. This means the star is a red variable star. The star has a B-V Colour Index of 1.79 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,073 Kelvin.

FU Cancri Radius has been calculated as being 136.08 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 94,687,564.87.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FU Cancri Apparent and Absolute Magnitudes

FU Cancri has an apparent magnitude of 9.02 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -3.08 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 FU Cancri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.38 which gave the calculated distance to FU Cancri as 8583.25 light years away from Earth or 2631.58 parsecs. It would take a spaceship travelling at the speed of light, 8583.25 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. FU Cancri brightness ranges from a magnitude of 9.106 to a magnitude of 9.008 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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Additional FU Cancri Facts and Figures

Visual Facts


Primary / Proper / Traditional NameFU Cancri
Alternative NamesHIP 42921, BD+08 2112, FU Cnc
Spectral TypeM0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationCancer
Absolute Magnitude -3.08
Visual / Apparent Magnitude9.02
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 44m 50.33
Declination (Dec.)+07° 37` 17.4
Galactic Latitude28.64 degrees
Galactic Longitude219.25 degrees
Distance from Earth0.38 Parallax (milliarcseconds)
 8583.25 Light Years
 2631.58 Parsecs
 542,798,556.55 Astronomical Units
B-V Index1.79

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.070
Variable Magnitude Range (Brighter - Dimmer)9.008 - 9.106

Estimated Calculated Facts


Radius (x the Sun)136.08
Effective Temperature3,073 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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