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32 Comae Berenices, HD111862, HIP62807, HR4884

32 Comae Berenices is a red giant star that can be located in the constellation of ComaBerenices. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

32 Comae Berenices's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR4884. HIP62807 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD111862.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 32 Comae Berenices with it shortened to 32 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+17 2551.

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

Location of 32 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 32 Comae Berenices, the location is 12h 52m 12.26 and +17° 04` 26.2 .

Proper Motion of 32 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 -4.68 ± 0.23 miliarcseconds/year towards the north and 1.16 ± 0.39 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -3.95000 km/s with an error of about 0.18 km/s .

Physical Properties (Colour, Temperature) of 32 Comae Berenices

32 Comae Berenices has a spectral type of M0III. This means the star is a red giant star. The star has a B-V Colour Index of 1.62 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,728 Kelvin.

32 Comae Berenices Radius has been calculated as being 68.54 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 47,693,575.23.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 73.11. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

32 Comae Berenices Apparent and Absolute Magnitudes

32 Comae Berenices has an apparent magnitude of 6.32 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 -2.43 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.57. 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 32 Comae Berenices

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.78 which gave the calculated distance to 32 Comae Berenices as 1832.38 light years away from Earth or 561.80 parsecs. It would take a spaceship travelling at the speed of light, 1832.38 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 1.67 which put 32 Comae Berenices at a distance of 1953.07 light years or 598.80 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. 32 Comae Berenices brightness ranges from a magnitude of 6.437 to a magnitude of 6.398 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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32 Comae Berenices Facts

Visual Facts

Alternative NamesHD 111862, HIP 62807, HR 4884, 32 Com, BD+17 2551
Star TypeGiant Star
GalaxyMilky Way
ConstellationComa Berenices
Absolute Magnitude-2.43 / -2.57
Visual / Apparent Magnitude6.32
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)12h 52m 12.26
Declination (Dec.)+17° 04` 26.2
Galactic Latitude79.94 degrees
Galactic Longitude303.98 degrees
1997 Distance from Earth1.78 Parallax (milliarcseconds)
 1832.38 Light Years
 561.80 Parsecs
2007 Revised Distance from Earth1.67 Parallax (milliarcseconds)
 1953.07 Light Years
 598.80 Parsecs
Proper Motion Dec.-4.68 ± 0.23 milliarcseconds/year
Proper Motion RA.1.16 ± 0.39 milliarcseconds/year
B-V Index1.62
Radial Velocity-3.95 ± 0.18 km/s
Spectral TypeM0III
Colour(M) Red

Variable Star Details

Mean Variability Period in Days0.026
Variable Magnitude Range (Brighter - Dimmer)6.398 - 6.437

Estimated Facts

Calculated Effective Temperature3,728 Kelvin

Sources and Links

SIMBAD SourceLink

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