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Kappa Ophiuchi, 27 Ophiuchi, HD153210, HIP83000, HR6299

Kappa Ophiuchi is a orange to red star that can be located in the constellation of Ophiuchus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Kappa Ophiuchi is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6299. HIP83000 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD153210. The Id of the star in the Gould Star Catalogue is 65. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Location of Kappa Ophiuchi

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 Kappa Ophiuchi, the location is 16h 57m 40.27 and +09d 22` 30.2 .

Proper Motion of Kappa Ophiuchi

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 -10.38 ± 0.11 miliarcseconds/year towards the north and -292.13 ± 0.20 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 -55.86000 km/s with an error of about 0.19 km/s .

Physical Properties (Colour, Temperature, Radius) of Kappa Ophiuchi

Kappa Ophiuchi has a spectral type of K2IIIvar. This means the star is a orange to red star. The star is 7379.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24067.5931537600000000s. The star has a B-V Colour Index of 1.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,558 Kelvin.

Kappa Ophiuchi Radius has been calculated as being 9.06 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,307,082.15.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.67. 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 0.06 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Kappa Ophiuchi Apparent and Absolute Magnitudes

Kappa Ophiuchi has an apparent magnitude of 3.19 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 1.09 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.95. 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 Kappa Ophiuchi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 37.99 which gave the calculated distance to Kappa Ophiuchi as 85.86 light years away from Earth or 26.32 parsecs. It would take a spaceship travelling at the speed of light, 85.86 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 35.66 which put Kappa Ophiuchi at a distance of 91.46 light years or 28.04 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 7,379.00 Parsecs or 24,067.59 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.

Kappa Ophiuchi Facts

Alternative Names

Flamsteed Name27 Ophiuchi
Flamsteed Short Name27 Oph
Bayer DesignationKappa Ophiuchi
Hipparcos Library I.D.83000
Yale Bright Star Catalogue (HR) Id6299
Bonner DurchmusterungBD+09 3298
Gould I.D.65
Henry Draper Designation153210

Visual Facts

Star Type star
Absolute Magnitude1.09 / 0.95
Visual / Apparent Magnitude3.19
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 57m 40.27
Declination (Dec.)+09d 22` 30.2
Galactic Latitude29.50 degrees
Galactic Longitude28.37 degrees
1997 Distance from Earth37.99 Parallax (milliarcseconds)
 85.86 Light Years
 26.32 Parsecs
2007 Revised Distance from Earth35.66 Parallax (milliarcseconds)
 91.46 Light Years
 28.04 Parsecs
Galacto-Centric Distance24,067.59 Light Years / 7,379.00 Parsecs
Proper Motion Dec.-10.38 ± 0.11 milliarcseconds/year
Proper Motion RA.-292.13 ± 0.20 milliarcseconds/year
B-V Index1.16
Radial Velocity-55.86 ± 0.19 km/s
Iron Abundance0.06 ± 9.99 Fe/H
Spectral TypeK2IIIvar
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,558 Kelvin

Sources and Links

SIMBAD SourceLink

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