Universe Guide

24 Comae Berenices (24 Comae Berenices A) Star Facts

24 Comae Berenices Facts

  • 24 Comae Berenices is a giant star that can be located in the constellation of Coma Berenices. The description is based on the spectral class.
  • 24 Comae Berenices is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K2III) of the star, the star's colour is orange to red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 450.50 light years away from us. Distance

24 Comae Berenices's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR4792. HIP61418 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD109511.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 24 Comae Berenices A. The Flamsteed name can be shortened to 24 Com A.

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+19 2584.

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

Location of 24 Comae Berenices

The location of the giant 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 24 Comae Berenices, the location is 12h 35m 07.76 and +18° 22` 37.2 .

Radial Velocity and Proper Motion of 24 Comae Berenices

Proper Motion

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 22.24 ± 1.54 milliarcseconds/year towards the north and -0.48 ± 2.74 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 3.03000 km/s with an error of about 0.10 km/s . 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 24 Comae Berenices

24 Comae Berenices Colour and Temperature

Based on the star's spectral type of K2III , 24 Comae Berenices's colour and type is orange to red giant star. The star has a B-V Colour Index of 1.15 which means the star's temperature is about 4,576 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

24 Comae Berenices Radius

24 Comae Berenices estimated radius has been calculated as being 27.54 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,161,475.76.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 20.227301688868405939764791888. 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.

24 Comae Berenices Iron Abundance

24 Comae Berenices Iron Abundance is 0.00 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

24 Comae Berenices Apparent and Absolute Magnitudes

24 Comae Berenices has an apparent magnitude of 5.03 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 -1.34 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.67. 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 24 Comae Berenices

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.31000 which gave the calculated distance to 24 Comae Berenices as 614.24 light years away from Earth or 188.32 parsecs. If you want that in miles, it is about 3,610,886,849,224,300.61, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 7.24000 which put 24 Comae Berenices at a distance of 450.50 light years or 138.12 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 28,489,096.52 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 24 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)
Airbus A380736410,479,336.09
Speed of Sound (Mach 1)767.269393,750,811.47
Concorde (Mach 2)1,534.54196,875,149.14
New Horizons Probe33,0009,154,933.07
Speed of Light670,616,629.00450.50

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 24 Comae Berenices Facts and Figures

Visual Facts

Primary / Proper / Traditional Name24 Comae Berenices
Alternative NamesHD 109511, HIP 61418, HR 4792, 24 Comae Berenices A, 24 Com A, BD+19 2584
Spectral TypeK2III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationComa Berenices
Absolute Magnitude -1.34 / -0.67
Visual / Apparent Magnitude5.03
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)12h 35m 07.76
Declination (Dec.)+18° 22` 37.2
Galactic Latitude80.47749859 degrees
Galactic Longitude278.86173511 degrees
1997 Distance from Earth5.31000 Parallax (milliarcseconds)
 614.24 Light Years
 188.32 Parsecs
2007 Distance from Earth7.24000 Parallax (milliarcseconds)
 450.50 Light Years
 138.12 Parsecs
 28,489,096.52 Astronomical Units
Proper Motion Dec.22.24000 ± 1.54000 milliarcseconds/year
Proper Motion RA.-0.48000 ± 2.74000 milliarcseconds/year
B-V Index1.15
Radial Velocity3.03000 ± 0.10 km/s
Iron Abundance0.0000 ± 9.99 Fe/H
Associated / Clustered Stars24 Comae Berenices B

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)20.23
Effective Temperature4,576 Kelvin

Sources and Links

SIMBAD SourceLink

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