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Kappa1 Coronae Australis

Kappa1 Coronae Australis Facts

  • Kappa1 Coronae Australis is a multiple star system that can be located in the constellation of Corona Australis. The description is based on the spectral class.
  • Kappa1 Coronae Australis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B8) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 154.00 light years away from us. Distance

Kappa1 Coronae Australis's Alternative Names

Kappa1 Coronae Australis (Kap01 Cra) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

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 objects' alternative names can be found at Star Names .

Location of Kappa1 Coronae Australis

The location of the multiple star system 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 object 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 .

Radial Velocity and Proper Motion of Kappa1 Coronae Australis

Proper Motion

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 milliarcseconds/year towards the north and 12.01 ± 6.53 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -16.00000 km/s with an error of about 3.70 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of Kappa1 Coronae Australis

Kappa1 Coronae Australis Temperature and Colour

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

Kappa1 Coronae Australis Radius

Kappa1 Coronae Australis estimated 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 0.8323343817396227931002405290. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It 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 6.67000 which gave the calculated distance to Kappa1 Coronae Australis as 489.00 light years away from Earth or 149.93 parsecs. If you want that in miles, it is about 2,874,647,807,486,785.29, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 21.18000 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.

Using the 2007 distance, the star is roughly 9,737,693.65 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to Kappa1 Coronae Australis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking425,818,740,216.50
Car120860,624,673.88
Airbus A380736140,319,240.31
Speed of Sound (Mach 1)767.269134,600,721.35
Concorde (Mach 2)1,534.5467,300,272.96
New Horizons Probe33,0003,129,544.27
Speed of Light670,616,629.00154.00

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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Additional Kappa1 Coronae Australis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameKappa1 Coronae Australis
Alternative NamesKap01 Cra, HD 170867, HIP 90969, HR 6953
Spectral TypeB8
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeMultiple Star System
ColourBlue
GalaxyMilky Way
ConstellationCorona Australis
Absolute Magnitude 0.43 / 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-13.33142255 degrees
Galactic Longitude355.99834497 degrees
1997 Distance from Earth6.67000 Parallax (milliarcseconds)
 489.00 Light Years
 149.93 Parsecs
2007 Distance from Earth21.18000 Parallax (milliarcseconds)
 154.00 Light Years
 47.21 Parsecs
 9,737,693.65 Astronomical Units
Proper Motion Dec.-23.71000 ± 3.93000 milliarcseconds/year
Proper Motion RA.12.01000 ± 6.53000 milliarcseconds/year
B-V Index0.02
Radial Velocity-16.00000 ± 3.70 km/s
Associated / Clustered StarsKappa2 Coronae Australis

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)0.83
Effective Temperature9,824 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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