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KK Comae Berenices

KK Comae Berenices Facts

  • KK Comae Berenices is a eclipsing binary sys variable star that can be located in the constellation of Coma Berenices. The description is based on the spectral class.
  • KK Comae Berenices is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F8+...) of the star, the star's colour is yellow to white .
  • 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 1976.75 light years away from us. Distance

KK Comae Berenices's Alternative Names

HIP61204 is the reference name for the star in the Hipparcos Star Catalogue.

KK Comae Berenices has alternative name(s) :- KK Com, KK Com.

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+21 2429.

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

Location of KK Comae Berenices

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 KK Comae Berenices, the location is 12h 32m 31.08 and +21° 06` 03.4 .

Proper Motion of KK 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 -6.28 ± 1.45 milliarcseconds/year towards the north and -5.91 ± 2.27 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 KK Comae Berenices

KK Comae Berenices Temperature and Colour

Based on the star's spectral type of F8+... , KK Comae Berenices's colour and type is yellow to white variable star. The star has a B-V Colour Index of 0.46 which means the star's temperature is about 6,220 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

KK Comae Berenices Radius

KK Comae Berenices estimated radius has been calculated as being 1.95 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,354,493.18.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 6.2707189294274965643694378615. 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.

KK Comae Berenices Apparent and Absolute Magnitudes

KK Comae Berenices has an apparent magnitude of 9.45 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 3.08 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.54. 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 KK Comae Berenices

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.32000 which gave the calculated distance to KK Comae Berenices as 613.09 light years away from Earth or 187.97 parsecs. If you want that in miles, it is about 3,604,126,430,045,139.45, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.65000 which put KK Comae Berenices at a distance of 1976.75 light years or 606.06 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 125,007,977.41 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 KK Comae Berenices

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)
Walking4331,410,355,343.94
Car12011,047,011,844.80
Airbus A3807361,801,143,235.56
Speed of Sound (Mach 1)767.2691,727,740,103.37
Concorde (Mach 2)1,534.54863,868,925.79
New Horizons Probe33,00040,170,952.16
Speed of Light670,616,629.001,976.75

Variable Type of KK Comae Berenices

The star is a eclipsing binary sys 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. KK Comae Berenices brightness ranges from a magnitude of 9.768 to a magnitude of 9.539 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.1 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 KK Comae Berenices Facts and Figures

Visual Facts


Primary / Proper / Traditional NameKK Comae Berenices
Alternative NamesKK Com, HIP 61204, BD+21 2429, KK Com
Spectral TypeF8+...
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
ConstellationComa Berenices
Absolute Magnitude 3.08 / 0.54
Visual / Apparent Magnitude9.45
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)12h 32m 31.08
Declination (Dec.)+21° 06` 03.4
Galactic Latitude82.58803484 degrees
Galactic Longitude266.32302048 degrees
1997 Distance from Earth5.32000 Parallax (milliarcseconds)
 613.09 Light Years
 187.97 Parsecs
2007 Distance from Earth1.65000 Parallax (milliarcseconds)
 1976.75 Light Years
 606.06 Parsecs
 125,007,977.41 Astronomical Units
Proper Motion Dec.-6.28000 ± 1.45000 milliarcseconds/year
Proper Motion RA.-5.91000 ± 2.27000 milliarcseconds/year
B-V Index0.46

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days1.068
Variable Magnitude Range (Brighter - Dimmer)9.539 - 9.768

Estimated Calculated Facts


Radius (x the Sun)6.27
Effective Temperature6,220 Kelvin

Sources and Links


SIMBAD SourceLink

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
+21 2429.0A10.00000-24.00000-11.00000G0Yellow
B10.00000-22.00000-13.000001830

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