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Iota Coronae Borealis, 14 Coronae Borealis, HD143807, HIP78493

Iota Coronae Borealis is a blue star that can be located in the constellation of CoronaBorealis. Iota Coronae Borealis is the brightest star in Corona Borealis based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Iota Coronae Borealis is the Bayer Classification for the star. HIP78493 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD143807.

Location of Iota Coronae Borealis

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 Iota Coronae Borealis, the location is 16h 01m 26.59 and +29d51`03.9 .

Proper Motion of Iota Coronae Borealis

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 -6.56 ± 0.18 miliarcseconds/year towards the north and -38.31 ± 0.24 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Iota Coronae Borealis

Iota Coronae Borealis has a spectral type of A0p.... This means the star is a blue star. The star is 7358.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23999.0988515200000000s. The star has a B-V Colour Index of -0.05 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,775 Kelvin.

Iota Coronae Borealis Radius has been calculated as being 2.44 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,696,163.70.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.16. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.12 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Iota Coronae Borealis Apparent and Absolute Magnitudes

Iota Coronae Borealis has an apparent magnitude of 4.98 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 -0.18 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.08. 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 Iota Coronae Borealis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.29 which gave the calculated distance to Iota Coronae Borealis as 351.09 light years away from Earth or 107.64 parsecs. It would take a spaceship travelling at the speed of light, 351.09 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 10.46 which put Iota Coronae Borealis at a distance of 311.82 light years or 95.60 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.

The star's Galacto-Centric Distance is 7,358.00 Parsecs or 23,999.10 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Iota Coronae Borealis Facts

Alternative Names

Flamsteed Name14 Coronae Borealis
Flamsteed Short Name14 CrB
Bayer DesignationIota Coronae Borealis
Hipparcos Library I.D.78493
Bonner DurchmusterungBD+30 2738
Henry Draper Designation143807

Visual Facts

Star Type star
Absolute Magnitude-0.18 / 0.08
Visual / Apparent Magnitude4.98
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 01m 26.59
Declination (Dec.)+29d51`03.9
Galactic Latitude48.46 degrees
Galactic Longitude48.30 degrees
1997 Distance from Earth9.29 Parallax (milliarcseconds)
 351.09 Light Years
 107.64 Parsecs
2007 Revised Distance from Earth10.46 Parallax (milliarcseconds)
 311.82 Light Years
 95.60 Parsecs
Galacto-Centric Distance23,999.10 Light Years / 7,358.00 Parsecs
Proper Motion Dec.-6.56 ± 0.18 milliarcseconds/year
Proper Motion RA.-38.31 ± 0.24 milliarcseconds/year
B-V Index-0.05
Radial Velocity-20.80 ± 0.40 km/s
Iron Abundance0.12 ± 9.99 Fe/H
Spectral TypeA0p...
Colour(A) blue

Estimated Facts

Calculated Effective Temperature11,775 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Iota Coronae Borealis in Corona Borealis


Iota Coronae Borealis (Iota Coronae Borealis) Location in Corona Borealis

The map was generated using Night Vision, an awesome free application by Brian Simpson.


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