Universe Guide

FR Cancri

FR Cancri Facts

  • FR Cancri is a variable star that can be located in the constellation of Cancer. The description is based on the spectral class.
  • FR Cancri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K8) of the star, the star's colour is orange to red .
  • 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 111.66 light years away from us. Distance

FR Cancri's Alternative Names

HIP41889 is the reference name for the star in the Hipparcos Star Catalogue.

FR Cancri has alternative name(s) :- , FR 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+16 1753.

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

Location of FR 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 FR Cancri, the location is 08h 32m 30.59 and +15° 49` 27.0 .

Proper Motion of FR Cancri

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 -97.46 ± 1.04 milliarcseconds/year towards the north and -96.52 ± 1.85 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 FR Cancri

FR Cancri Temperature and Colour

Based on the star's spectral type of K8 , FR Cancri's colour and type is orange to red variable star. The star has a B-V Colour Index of 1.61 which means the star's temperature is about 3,747 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

FR Cancri Radius

FR Cancri estimated radius has been calculated as being 0.61 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 422,613.89.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 0.6272779649937297105513572744. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

FR Cancri Apparent and Absolute Magnitudes

FR Cancri has an apparent magnitude of 10.41 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 7.81 If you used the 2007 Parallax value, you would get an absolute magnitude of 7.74. 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 FR Cancri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 30.24000 which gave the calculated distance to FR Cancri as 107.86 light years away from Earth or 33.07 parsecs. If you want that in miles, it is about 634,068,532,751,584.17, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 29.21000 which put FR Cancri at a distance of 111.66 light years or 34.23 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 7,060,395.12 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. The star's Galacto-Centric Distance is 7,426.00 Parsecs or 24,220.89 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to FR Cancri

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 A380736101,740,560.86
Speed of Sound (Mach 1)767.26997,594,263.28
Concorde (Mach 2)1,534.5448,797,068.04
New Horizons Probe33,0002,269,122.81
Speed of Light670,616,629.00111.66
FR Cancri brightness ranges from a magnitude of 10.471 to a magnitude of 10.276 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.

Hide Explanations
Show GridLines

Additional FR Cancri Facts and Figures

Visual Facts

Primary / Proper / Traditional NameFR Cancri
Alternative NamesHIP 41889, BD+16 1753, FR Cnc
Spectral TypeK8
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 7.81 / 7.74
Visual / Apparent Magnitude10.41
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)08h 32m 30.59
Declination (Dec.)+15° 49` 27.0
Galactic Latitude29.32988639 degrees
Galactic Longitude209.28685741 degrees
1997 Distance from Earth30.24000 Parallax (milliarcseconds)
 107.86 Light Years
 33.07 Parsecs
2007 Distance from Earth29.21000 Parallax (milliarcseconds)
 111.66 Light Years
 34.23 Parsecs
 7,060,395.12 Astronomical Units
Galacto-Centric Distance24,220.89 Light Years / 7,426.00 Parsecs
Proper Motion Dec.-97.46000 ± 1.04000 milliarcseconds/year
Proper Motion RA.-96.52000 ± 1.85000 milliarcseconds/year
B-V Index1.61

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.172
Variable Magnitude Range (Brighter - Dimmer)10.276 - 10.471

Estimated Calculated Facts

Radius (x the Sun)0.63
Effective Temperature3,747 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine