V Coronae Australis is a eruptive star that can be located in the constellation of CoronaAustralis. V Coronae Australis is the brightest star in Corona Australis based on the Hipparcos 2007 apparent magnitude. The star can not be seen by the naked eye, you need a telescope to see it.
HIP92207 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD173539.
V Coronae Australis has alternative name(s), V CrA.
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 V Coronae Australis, the location is 18h 47m 32.31 and -38d09`32.3 .
V Coronae Australis has a spectral type of R0. This means the star is a star. The star has a B-V Colour Index of 0.62 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,829 Kelvin.
V Coronae Australis Radius has been calculated as being 7.76 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,397,543.92.km. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.
V Coronae Australis has an apparent magnitude of 10.00 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 0.36 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.18 which gave the calculated distance to V Coronae Australis as 2764.10 light years away from Earth or 847.46 parsecs. It would take a spaceship travelling at the speed of light, 2764.10 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is a eruptive R Coronae Borealis variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. V Coronae Australis brightness ranges from a magnitude of 10.899 to a magnitude of 10.001 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.1 days (variability).
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.
|Traditional/Proper Name||V Coronae Australis|
|Short Name||V CrA|
|Hipparcos Library I.D.||92207|
|Henry Draper Designation||173539|
|Visual / Apparent Magnitude||10.00|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||18h 47m 32.31|
|Galactic Latitude||-15.65 degrees|
|Galactic Longitude||357.66 degrees|
|1997 Distance from Earth||1.18 Parallax (milliarcseconds)|
|2764.10 Light Years|
|Radial Velocity||-11.00 ± 999.00 km/s|
|Variable Star Class||Eruptive|
|Variable Star Type||R Coronae Borealis|
|Mean Variability Period in Days||1.050|
|Variable Magnitude Range (Brighter - Dimmer)||10.001 - 10.899|
|Calculated Effective Temperature||5,829 Kelvin|