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RW Coronae Australis

RW Coronae Australis Facts

RW Coronae Australis's Alternative Names

HIP88081 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD163726.

RW Coronae Australis has alternative name(s) :- RW CrA, RW CrA.

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

Location of RW Coronae Australis

The location of the giant 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 object is compared to the celestial equator and is expressed in degrees. For RW Coronae Australis, the location is 17h 59m 20.30 and -37° 52` 52.6 .

Physical Properties (Colour, Temperature) of RW Coronae Australis

RW Coronae Australis Colour and Temperature

RW Coronae Australis has a spectral type of B9III. This means the star is a blue giant star. The star has a B-V Colour Index of 0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,538 Kelvin.

RW Coronae Australis Radius

Radius has been calculated as being 6.55 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,557,059.09.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

RW Coronae Australis Apparent and Absolute Magnitudes

RW Coronae Australis has an apparent magnitude of 9.42 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -0.93 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 RW Coronae Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.85 which gave the calculated distance to RW Coronae Australis as 3837.22 light years away from Earth or 1176.47 parsecs. It would take a spaceship travelling at the speed of light, 3837.22 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of RW Coronae Australis

The star is a eclipsing Beta Persei (Algol)/ 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. RW Coronae Australis brightness ranges from a magnitude of 10.411 to a magnitude of 9.422 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.7 days (variability).

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 RW Coronae Australis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameRW Coronae Australis
Alternative NamesRW CrA, HD 163726, HIP 88081, RW CrA
Spectral TypeB9III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourBlue
GalaxyMilky Way
ConstellationCorona Australis
Absolute Magnitude -0.93
Visual / Apparent Magnitude9.42
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)17h 59m 20.30
Declination (Dec.)-37° 52` 52.6
Galactic Latitude-6.99 degrees
Galactic Longitude353.71 degrees
Distance from Earth0.85 Parallax (milliarcseconds)
 3837.22 Light Years
 1176.47 Parsecs
 242,662,665.71 Astronomical Units
B-V Index0.09
Radial Velocity0.00 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/
Mean Variability Period in Days1.684
Variable Magnitude Range (Brighter - Dimmer)9.422 - 10.411

Estimated Calculated Facts


Radius (x the Sun)6.55
Effective Temperature8,538 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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