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Omicron Coronae Borealis, 1 Coronae Borealis, HD136512, HIP75049, HR5709

Omicron Coronae Borealis is a orange to red giant star that can be located in the constellation of CoronaBorealis. Omicron 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.

Omicron Coronae Borealis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5709. HIP75049 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD136512.

Omicron Coronae Borealis has alternative name(s), 1 CrB, Omi CrB. Omicron Coronae Borealis has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of Omicron 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 Omicron Coronae Borealis, the location is 15h 20m 08.64 and +29d 36` 58.7 .

Proper Motion of Omicron 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 -42.44 ± 0.28 miliarcseconds/year towards the north and -117.98 ± 0.44 miliarcseconds/year east if we saw them in the horizon.

Omicron Coronae Borealis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 96.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Mass, Radius) of Omicron Coronae Borealis

Omicron Coronae Borealis has a spectral type of K0III. This means the star is a orange to red giant star. The star is 7370.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24038.2384528000000000s. The star has a B-V Colour Index of 1.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,830 Kelvin.

Omicron Coronae Borealis Radius has been calculated as being 8.85 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,158,640.18.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 8.73. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 2.13 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is -0.290000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

Omicron Coronae Borealis Apparent and Absolute Magnitudes

Omicron Coronae Borealis has an apparent magnitude of 5.51 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 0.89 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.92. 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 Omicron Coronae Borealis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.90 which gave the calculated distance to Omicron Coronae Borealis as 274.09 light years away from Earth or 84.03 parsecs. It would take a spaceship travelling at the speed of light, 274.09 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 12.08 which put Omicron Coronae Borealis at a distance of 270.00 light years or 82.78 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 7,370.00 Parsecs or 24,038.24 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.

Omicron Coronae Borealis Facts

Alternative Names

Flamsteed Name1 Coronae Borealis
Short Name1 CrB, Omi CrB
Bayer DesignationOmicron Coronae Borealis
Hipparcos Library I.D.75049
Yale Bright Star Catalogue (HR) Id5709
Bonner DurchmusterungBD+30 2647
Henry Draper Designation136512

Visual Facts

Star Typegiant star
ConstellationCorona Borealis
Absolute Magnitude0.89 / 0.92
Visual / Apparent Magnitude5.51
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 20m 08.64
Declination (Dec.)+29d 36` 58.7
Galactic Latitude57.33 degrees
Galactic Longitude46.21 degrees
1997 Distance from Earth11.90 Parallax (milliarcseconds)
 274.09 Light Years
 84.03 Parsecs
2007 Revised Distance from Earth12.08 Parallax (milliarcseconds)
 270.00 Light Years
 82.78 Parsecs
Galacto-Centric Distance24,038.24 Light Years / 7,370.00 Parsecs
Proper Motion Dec.-42.44 ± 0.28 milliarcseconds/year
Proper Motion RA.-117.98 ± 0.44 milliarcseconds/year
B-V Index1.01
Radial Velocity-54.15 ± 0.20 km/s
Iron Abundance-0.33 ± 9.99 Fe/H
Spectral TypeK0III
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Luminosity (x the Sun)96.0000000
Calculated Effective Temperature4,830 Kelvin
Mass Compared to the Sun2.13

Sources and Links

SIMBAD SourceLink

Related Stars

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
136512+30 2647.0A5.60000-46.00000-44.00000K0Orange

List of Extrasolar Planets orbiting Omicron Coronae Borealis

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
omi CrB bConfirmed187.3000.19120120.8379.0002012.000

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