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FK Comae Berenices - HD117555 - HIP65915

FK Comae Berenices is a white to yellow rotating luminous giant star that can be located in the constellation of ComaBerenices. HIP65915 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD117555. FK Comae Berenices has alternative name(s), FK_Com.

Location of FK Comae Berenices

The location of the star in the galaxy 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 FK Comae Berenices, the location is 13h 30m 46.84 and +24d13`57.9 .

Proper Motion of FK Comae Berenices

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 -019.71 ± 000.41 towards the north and -053.11 ± 000.68 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of FK Comae Berenices

FK Comae Berenices has a spectral type of G5II. This means the star is a white to yellow luminous giant star. The star has a B-V Colour Index of 0.87 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,262 Kelvin.

FK Comae Berenices has been calculated as 6.17 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,296,090.09.km.

FK Comae Berenices Apparent and Absolute Magnitudes

FK Comae Berenices has an apparent magnitude of 8.15 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 1.30 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.03. 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 FK Comae Berenices

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.27 which gave the calculated distance to FK Comae Berenices as 763.85 light years away from Earth or 234.19 parsecs. It would take a spaceship travelling at the speed of light, 763.85 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 5.96 which put FK Comae Berenices at a distance of 547.25 light years or 167.79 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.

Variable Type of FK Comae Berenices

The star is a rotating FK Comae Berenices 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. FK Comae Berenices brightness ranges from a magnitude of 8.000 to a magnitude of 8.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.0 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

FK Comae Berenices Facts

Alternative Names

Traditional NameFK Comae Berenices
Short NameFK Com
Hipparcos Library I.D.65915
Bonner DurchmusterungBD+24 2592
Henry Draper Designation117555

Visual Facts

Star Typeluminous giant star
Absolute Magnitude1.30 / 2.03
Apparent Magnitude8.15
Right Ascension (R.A.)13h 30m 46.84
Declination (Dec.)+24d13`57.9
1997 Distance from Earth4.27 Parallax (milliarcseconds)
 763.85 Light Years
 234.19 Parsecs
2007 Revised Distance from Earth5.96 Parallax (milliarcseconds)
 547.25 Light Years
 167.79 Parsecs
Proper Motion Dec.-19.71 ± 0.41 milliarcseconds/year
Proper Motion RA.-53.11 ± 0.68 milliarcseconds/year
B-V Index0.87
Spectral TypeG5II
Colour(G) White to Yellow

Variable Star Details

Variable Star ClassRotating
Variable Star TypeFK Comae Berenices
Mean Variability Period in Days2.000

Estimated Facts

Radius (x the Sun)6.17
Calculated Effective Temperature5,262 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
117555+24 2592.0C8.00000-63.00000-30.00000G5Yellow1930
D12.700001908

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