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V701 Coronae Australis, HD176723, HIP93552

V701 Coronae Australis is a blue to white pulsating subgiant star that can be located in the constellation of CoronaAustralis. V701 Coronae Australis is the brightest star in Corona Australis based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 1.10 Billion of Years but could be as young as 1.00 to 1.20 according to Hipparcos.

HIP93552 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD176723.

V701 Coronae Australis has alternative name(s), V701 CrA.

Location of V701 Coronae Australis

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 V701 Coronae Australis, the location is 19h 03m 17.69 and -38d15`11.5 .

Proper Motion of V701 Coronae Australis

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 14.45 ± 0.23 miliarcseconds/year towards the north and 13.02 ± 0.43 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of V701 Coronae Australis

V701 Coronae Australis has a spectral type of F2III/IV. This means the star is a blue to white subgiant star. The star is 7335.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23924.0812824000000000s. The star has a B-V Colour Index of 0.32 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,116 Kelvin.

V701 Coronae Australis Radius has been calculated as being 2.83 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,971,966.16.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.01. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.06 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.10 Billion years old but could be between 1.00 and 1.20 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

V701 Coronae Australis Apparent and Absolute Magnitudes

V701 Coronae Australis has an apparent magnitude of 5.73 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 1.68 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.55. 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 V701 Coronae Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 15.47 which gave the calculated distance to V701 Coronae Australis as 210.84 light years away from Earth or 64.64 parsecs. It would take a spaceship travelling at the speed of light, 210.84 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 14.60 which put V701 Coronae Australis at a distance of 223.40 light years or 68.49 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.

The star's Galacto-Centric Distance is 7,335.00 Parsecs or 23,924.08 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V701 Coronae Australis

The star is a pulsating Delta Scuti 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. V701 Coronae Australis brightness ranges from a magnitude of 5.824 to a magnitude of 5.792 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

V701 Coronae Australis Facts

Alternative Names

Traditional/Proper NameV701 Coronae Australis
Short NameV701 CrA
Hipparcos Library I.D.93552
Henry Draper Designation176723

Visual Facts

Star Typesubgiant star
Age1.10 Billion Years Old
Age Range1.00 - 1.20 Billion Years Old
Absolute Magnitude1.68 / 1.55
Visual / Apparent Magnitude5.73
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 03m 17.69
Declination (Dec.)-38d15`11.5
Galactic Latitude-18.57 degrees
Galactic Longitude358.75 degrees
1997 Distance from Earth15.47 Parallax (milliarcseconds)
 210.84 Light Years
 64.64 Parsecs
2007 Revised Distance from Earth14.60 Parallax (milliarcseconds)
 223.40 Light Years
 68.49 Parsecs
Galacto-Centric Distance23,924.08 Light Years / 7,335.00 Parsecs
Proper Motion Dec.14.45 ± 0.23 milliarcseconds/year
Proper Motion RA.13.02 ± 0.43 milliarcseconds/year
B-V Index0.32
Radial Velocity4.00 ± 7.40 km/s
Iron Abundance0.06 ± 9.99 Fe/H
Spectral TypeF2III/IV
Colour(F) blue to white

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeDelta Scuti
Mean Variability Period in Days0.024
Variable Magnitude Range (Brighter - Dimmer)5.792 - 5.824

Estimated Facts

Calculated Effective Temperature7,116 Kelvin

Sources and Links

SIMBAD SourceLink

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