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IN Comae Berenices, HD112313, HIP63087

IN Comae Berenices is a white to yellow pulsating star that can be located in the constellation of ComaBerenices. IN Comae Berenices is the brightest star in Coma Berenices based on the Hipparcos 2007 apparent magnitude. The star can not be seen by the naked eye, you need a telescope to see it.

HIP63087 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD112313.

IN Comae Berenices has alternative name(s), IN Com.

Location of IN 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 IN Comae Berenices, the location is 12h 55m 33.76 and +25d53`30.6 .

Proper Motion of IN 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 1.04 ± 0.82 miliarcseconds/year towards the north and -23.63 ± 1.12 miliarcseconds/year east if we saw them in the horizon.

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

IN Comae Berenices has a spectral type of G5. This means the star is a white to yellow star. The star has a B-V Colour Index of 0.83 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,353 Kelvin.

IN Comae Berenices Radius has been calculated as being 21.76 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 15,142,869.09.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 14.99. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

IN Comae Berenices Apparent and Absolute Magnitudes

IN Comae Berenices has an apparent magnitude of 8.89 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 -1.51 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.70. 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 IN Comae Berenices

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.83 which gave the calculated distance to IN Comae Berenices as 3929.68 light years away from Earth or 1204.82 parsecs. It would take a spaceship travelling at the speed of light, 3929.68 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 1.21 which put IN Comae Berenices at a distance of 2695.56 light years or 826.45 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 IN Comae Berenices

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. IN Comae Berenices brightness ranges from a magnitude of 9.098 to a magnitude of 8.969 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.

IN Comae Berenices Facts

Alternative Names

Traditional/Proper NameIN Comae Berenices
Short NameIN Com
Hipparcos Library I.D.63087
Bonner DurchmusterungBD+26 2405
Henry Draper Designation112313

Visual Facts

Star Type star
Absolute Magnitude-1.51 / -0.70
Visual / Apparent Magnitude8.89
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)12h 55m 33.76
Declination (Dec.)+25d53`30.6
Galactic Latitude88.46 degrees
Galactic Longitude339.90 degrees
1997 Distance from Earth0.83 Parallax (milliarcseconds)
 3929.68 Light Years
 1204.82 Parsecs
2007 Revised Distance from Earth1.21 Parallax (milliarcseconds)
 2695.56 Light Years
 826.45 Parsecs
Proper Motion Dec.1.04 ± 0.82 milliarcseconds/year
Proper Motion RA.-23.63 ± 1.12 milliarcseconds/year
B-V Index0.83
Radial Velocity-16.50 ± 0.20 km/s
Spectral TypeG5
Colour(G) White to Yellow

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral probably
Mean Variability Period in Days0.085
Variable Magnitude Range (Brighter - Dimmer)8.969 - 9.098

Estimated Facts

Calculated Effective Temperature5,353 Kelvin

Sources and Links

SIMBAD SourceLink

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