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Kappa Lyrae, 1 Lyrae, HD168775, HIP89826, HR6872

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

Kappa Lyrae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6872. HIP89826 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD168775.

Location of Kappa Lyrae

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 Lyrae, the location is 18h 19m 51.72 and +36d 03` 52.0 .

Proper Motion of Kappa Lyrae

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 41.09 ± 0.13 miliarcseconds/year towards the north and -16.75 ± 0.14 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 -24.15000 km/s with an error of about 0.20 km/s .

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

Kappa Lyrae has a spectral type of K2IIIvar. This means the star is a orange to red star. The star is 7368.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24031.7151859200000000s. 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 Lyrae Radius has been calculated as being 14.84 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 10,323,785.97.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 15.75. 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 0.09 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Kappa Lyrae Apparent and Absolute Magnitudes

Kappa Lyrae has an apparent magnitude of 4.33 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 0.02 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.11. 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 Lyrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.71 which gave the calculated distance to Kappa Lyrae as 237.90 light years away from Earth or 72.94 parsecs. It would take a spaceship travelling at the speed of light, 237.90 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 12.96 which put Kappa Lyrae at a distance of 251.67 light years or 77.16 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.

The star's Galacto-Centric Distance is 7,368.00 Parsecs or 24,031.72 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 Lyrae Facts

Alternative Names

Flamsteed Name1 Lyrae
Flamsteed Short Name1 Lyr
Bayer DesignationKappa Lyrae
Hipparcos Library I.D.89826
Yale Bright Star Catalogue (HR) Id6872
Bonner DurchmusterungBD+36 3094
Henry Draper Designation168775

Visual Facts

Star Type star
Absolute Magnitude0.02 / -0.11
Visual / Apparent Magnitude4.33
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 19m 51.72
Declination (Dec.)+36d 03` 52.0
Galactic Latitude21.55 degrees
Galactic Longitude63.52 degrees
1997 Distance from Earth13.71 Parallax (milliarcseconds)
 237.90 Light Years
 72.94 Parsecs
2007 Revised Distance from Earth12.96 Parallax (milliarcseconds)
 251.67 Light Years
 77.16 Parsecs
Galacto-Centric Distance24,031.72 Light Years / 7,368.00 Parsecs
Proper Motion Dec.41.09 ± 0.13 milliarcseconds/year
Proper Motion RA.-16.75 ± 0.14 milliarcseconds/year
B-V Index1.16
Radial Velocity-24.15 ± 0.20 km/s
Iron Abundance0.09 ± 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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