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Kappa1 Coronae Australis, HD170867, HIP90969, HR6953

Kappa1 Coronae Australis is a blue multiple star system that can be located in the constellation of Corona Australis. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Kappa1 Coronae Australis's Alternative Names

Kappa1 Coronae Australis (Kap01 Cra) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6953. HIP90969 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD170867.

More details on star alternative names can be found at Star Names .

Location of Kappa1 Coronae Australis

The location of the star in the night sky 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 Kappa1 Coronae Australis, the location is 18h 33m 23.08 and -38° 43` 12.0 .

Proper Motion of Kappa1 Coronae Australis

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 -23.71 ± 3.93 miliarcseconds/year towards the north and 12.01 ± 6.53 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 -16.00000 km/s with an error of about 3.70 km/s .

Physical Properties (Colour, Temperature) of Kappa1 Coronae Australis

Kappa1 Coronae Australis has a spectral type of B8. This means the star is a blue multiple star system. The star has a B-V Colour Index of 0.02 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,824 Kelvin.

Kappa1 Coronae Australis Radius has been calculated as being 2.64 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,839,953.73.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.83. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Kappa1 Coronae Australis Apparent and Absolute Magnitudes

Kappa1 Coronae Australis has an apparent magnitude of 6.31 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 0.43 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.94. 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 Kappa1 Coronae Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.67 which gave the calculated distance to Kappa1 Coronae Australis as 489.00 light years away from Earth or 149.93 parsecs. It would take a spaceship travelling at the speed of light, 489.00 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 21.18 which put Kappa1 Coronae Australis at a distance of 154.00 light years or 47.21 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.

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Kappa1 Coronae Australis Facts

Visual Facts

Primary / Proper / Traditional NameKappa1 Coronae Australis
Alternative NamesKap01 Cra, HD 170867, HIP 90969, HR 6953
Spectral TypeB8
Multiple Star SystemYes
Star TypeMultiple Star System
Colour blue
GalaxyMilky Way
ConstellationCorona Australis
Absolute Magnitude0.43 / 2.94
Visual / Apparent Magnitude6.31
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 33m 23.08
Declination (Dec.)-38° 43` 12.0
Galactic Latitude-13.33 degrees
Galactic Longitude356.00 degrees
1997 Distance from Earth6.67 Parallax (milliarcseconds)
 489.00 Light Years
 149.93 Parsecs
2007 Distance from Earth21.18 Parallax (milliarcseconds)
 154.00 Light Years
 47.21 Parsecs
Proper Motion Dec.-23.71 ± 3.93 milliarcseconds/year
Proper Motion RA.12.01 ± 6.53 milliarcseconds/year
B-V Index0.02
Radial Velocity-16.00 ± 3.70 km/s
Associated / Clustered StarsKappa2 Coronae Australis

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Facts

Calculated Effective Temperature9,824 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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