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Nusakan (Beta Coronae Borealis) - HD137909 - HIP75695 - HR5747

Nusakan (Beta Coronae Borealis) is a blue to white rotating star that can be located in the constellation of CoronaBorealis. Beta Coronae Borealis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5747. HIP75695 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD137909. Nusakan has alternative name(s), 3 Coronae Borealis , bet_CrB, 3 CrB.

Location of Nusakan

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 Nusakan, the location is 15h 27m 49.85 and +29d06`19.8 .

Proper Motion of Nusakan

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 085.92 ± 000.51 towards the north and -180.17 ± 000.76 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Nusakan

Nusakan has a spectral type of F0p. This means the star is a blue to white star. The star has a B-V Colour Index of 0.31 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,743 Kelvin.

Nusakan has been calculated as 4.44 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,087,964.38.km.

Nusakan Apparent and Absolute Magnitudes

Nusakan has an apparent magnitude of 3.66 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 0.94 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.98. 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 Nusakan

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 28.60 which gave the calculated distance to Nusakan as 114.04 light years away from Earth or 34.97 parsecs. It would take a spaceship travelling at the speed of light, 114.04 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 29.17 which put Nusakan at a distance of 111.81 light years or 34.28 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 Nusakan

The star is a rotating Alpha2 Canum Venaticorum 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. Nusakan brightness ranges from a magnitude of 4.000 to a magnitude of 4.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 19.0 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Nusakan Facts

Alternative Names

Traditional NameNusakan
Short Namebet CrB, 3 CrB
Bayer DesignationBeta Coronae Borealis
Alternative Name(s)3 Coronae Borealis
Hipparcos Library I.D.75695
Yale Bright Star Catalogue (HR) Id5747
Bonner DurchmusterungBD+29 2670
Henry Draper Designation137909

Visual Facts

Star Type star
Absolute Magnitude0.94 / 0.98
Apparent Magnitude3.66
Right Ascension (R.A.)15h 27m 49.85
Declination (Dec.)+29d06`19.8
1997 Distance from Earth28.60 Parallax (milliarcseconds)
 114.04 Light Years
 34.97 Parsecs
2007 Revised Distance from Earth29.17 Parallax (milliarcseconds)
 111.81 Light Years
 34.28 Parsecs
Proper Motion Dec.85.92 ± 0.51 milliarcseconds/year
Proper Motion RA.-180.17 ± 0.76 milliarcseconds/year
B-V Index0.31
Eccentricity0.54
Inclination111.11
Semi-Major Axis56.39
Orbital Period (Days)3853.80
Argument Of Periastron178.08
Spectral TypeF0p
Colour(F) blue to white

Variable Star Details

Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days19.000

Estimated Facts

Radius (x the Sun)4.44
Calculated Effective Temperature6,743 Kelvin

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
137909+29 2670.0A3.70000-180.0000083.00000F0Yellow/White
B1945

Location of Nusakan in Corona Borealis


Nusakan (Beta Coronae Borealis) Location in Corona Borealis

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


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