Universe Guide

V Coronae Australis

V Coronae Australis Facts

  • V Coronae Australis is a eruptive variable star that can be located in the constellation of Corona Australis. The description is based on the spectral class.
  • V Coronae Australis is not part of the constellation outline but is within the borders of the constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 2764.10 light years away from us. Distance

V Coronae Australis's Alternative Names

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.

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

Location of V Coronae Australis

The location of the variable 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 V Coronae Australis, the location is 18h 47m 32.31 and -38° 09` 32.3 .

Physical Properties of V Coronae Australis

V Coronae Australis Colour

Based on the star's spectral type of R0 The star has a B-V Colour Index of 0.62 which means the star's temperature is about 5,829 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

V Coronae Australis Radius

V Coronae Australis estimated 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. 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 rather than peer reviewed papers. It has been known to produce widely incorrect figures.

V Coronae Australis Apparent and Absolute Magnitudes

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. Using the supplied 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.

Distance to V Coronae Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.18000 which gave the calculated distance to V Coronae Australis as 2764.10 light years away from Earth or 847.46 parsecs. If you want that in miles, it is about 16,249,108,394,016,816.40, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to V 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 A3807362,518,548,130.73
Speed of Sound (Mach 1)767.2692,415,908,142.02
Concorde (Mach 2)1,534.541,207,952,496.66
New Horizons Probe33,00056,171,255.28
Speed of Light670,616,629.002,764.10

Variable Type of V Coronae Australis

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).

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.

Hide Explanations
Show GridLines

Additional V Coronae Australis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV Coronae Australis
Alternative NamesHD 173539, HIP 92207, V CrA
Spectral TypeR0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
ConstellationCorona Australis
Absolute Magnitude 0.36
Visual / Apparent Magnitude10.00
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 47m 32.31
Declination (Dec.)-38° 09` 32.3
Galactic Latitude-15.65365315 degrees
Galactic Longitude357.66472186 degrees
Distance from Earth1.18000 Parallax (milliarcseconds)
 2764.10 Light Years
 847.46 Parsecs
 174,799,954.68 Astronomical Units
B-V Index0.62
Radial Velocity-11.00000 ± 999.00 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeR Coronae Borealis
Mean Variability Period in Days1.050
Variable Magnitude Range (Brighter - Dimmer)10.001 - 10.899

Estimated Calculated Facts

Radius (x the Sun)7.76
Effective Temperature5,829 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine