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Kappa Herculis - HD145000 - HIP79045

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

Kappa Herculis is the Bayer Classification for the star. HIP79045 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD145000.

Kappa Herculis has alternative name(s), 7 Herculis , 7 Her. Kappa Herculis is a multiple star system with 2 stars orbiting in its solar system.

Location of Kappa Herculis

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 Herculis, the location is 16h 08m 04.97 and +17d03`16.0 .

Proper Motion of Kappa Herculis

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 -39.45 ± 1.58 miliarcseconds/year towards the north and -25.70 ± 1.98 miliarcseconds/year east if we saw them in the horizon.

Kappa Herculis 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 82.0000000 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, Radius) of Kappa Herculis

Kappa Herculis has a spectral type of K1III. This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,593 Kelvin.

Kappa Herculis Radius has been calculated as being 11.99 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,340,469.94.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 53.55. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, Kappa Herculis B.

Kappa Herculis Apparent and Absolute Magnitudes

Kappa Herculis has an apparent magnitude of 6.25 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 0.45 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.80. 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 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.92 which gave the calculated distance to Kappa Herculis as 471.33 light years away from Earth or 144.51 parsecs. It would take a spaceship travelling at the speed of light, 471.33 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 1.55 which put Kappa Herculis at a distance of 2104.28 light years or 645.16 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.

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 Herculis Facts

Alternative Names

Short Name7 Her
Bayer DesignationKappa Herculis
Alternative Name(s)7 Herculis
Hipparcos Library I.D.79045
Bonner DurchmusterungBDD+17 2965
Henry Draper Designation145000

Visual Facts

Star Typegiant star
Absolute Magnitude0.45 / -2.80
Visual / Apparent Magnitude6.25
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)16h 08m 04.97
Declination (Dec.)+17d03`16.0
Galactic Latitude43.64 degrees
Galactic Longitude31.03 degrees
1997 Distance from Earth6.92 Parallax (milliarcseconds)
 471.33 Light Years
 144.51 Parsecs
2007 Revised Distance from Earth1.55 Parallax (milliarcseconds)
 2104.28 Light Years
 645.16 Parsecs
Proper Motion Dec.-39.45 ± 1.58 milliarcseconds/year
Proper Motion RA.-25.70 ± 1.98 milliarcseconds/year
B-V Index1.14
Radial Velocity32.21 ± 0.16 km/s
Spectral TypeK1III
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Stars in Solar System2
Companion StarsKappa Herculis B

Estimated Facts

Luminosity (x the Sun)82.0000000
Calculated Effective Temperature4,593 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
145000+17 2965.0B6.50000-35.00000-29.00000G5Yellow1958
C13.600001912

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