Universe Guide

R Coronae Australis

R Coronae Australis Facts

  • R Coronae Australis is a luminous giant star that can be located in the constellation of Corona Australis. The description is based on the spectral class.
  • R Coronae Australis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A5IIevar) of the star, the star's colour is blue - white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 79.69 light years away from us. Distance

R Coronae Australis's Alternative Names

HIP93449 is the reference name for the star in the Hipparcos Star Catalogue.

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

Location of R Coronae Australis

The location of the luminous 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 R Coronae Australis, the location is 19h 01m 53.68 and -36° 57` 08.1 .

Radial Velocity and Proper Motion of R 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 20.57 ± 15.79 milliarcseconds/year towards the north and -28.30 ± 27.95 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 -36.00000 km/s with an error of about 4.90 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 R Coronae Australis

R Coronae Australis Colour and Temperature

Based on the star's spectral type of A5IIevar , R Coronae Australis's colour and type is blue - white luminous giant star. Based on the star's spectral, the stars temperature is between 7,500.00 and 10,000.00 degrees kelvin.

R Coronae Australis Apparent and Absolute Magnitudes

R Coronae Australis has an apparent magnitude of 11.57 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 12.00 If you used the 2007 Parallax value, you would get an absolute magnitude of 9.63. 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 R Coronae Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 121.75000 which gave the calculated distance to R Coronae Australis as 26.79 light years away from Earth or 8.21 parsecs. If you want that in miles, it is about 157,488,373,747,588.91, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 40.93000 which put R Coronae Australis at a distance of 79.69 light years or 24.43 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 5,039,014.10 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 R 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)
Airbus A38073672,610,651.04
Speed of Sound (Mach 1)767.26969,651,503.14
Concorde (Mach 2)1,534.5434,825,706.18
New Horizons Probe33,0001,619,437.55
Speed of Light670,616,629.0079.69

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 R Coronae Australis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameR Coronae Australis
Alternative NamesHIP 93449
Spectral TypeA5IIevar
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
GalaxyMilky Way
ConstellationCorona Australis
Absolute Magnitude 12.00 / 9.63
Visual / Apparent Magnitude11.57
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)19h 01m 53.68
Declination (Dec.)-36° 57` 08.1
Galactic Latitude-17.85162917 degrees
Galactic Longitude359.93343659 degrees
1997 Distance from Earth121.75000 Parallax (milliarcseconds)
 26.79 Light Years
 8.21 Parsecs
2007 Distance from Earth40.93000 Parallax (milliarcseconds)
 79.69 Light Years
 24.43 Parsecs
 5,039,014.10 Astronomical Units
Proper Motion Dec.20.57000 ± 15.79000 milliarcseconds/year
Proper Motion RA.-28.30000 ± 27.95000 milliarcseconds/year
B-V Index-99
Radial Velocity-36.00000 ± 4.90 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Calculated Temperature Range7,500.00 - 10,000.00

Sources and Links

SIMBAD SourceLink

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