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V718 Scorpii, HD145718, HIP79476

V718 Scorpii is a blue subgiant star that can be located in the constellation of Scorpius. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

V718 Scorpii's Alternative Names

HIP79476 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD145718.

V718 Scorpii has alternative name(s) :- , V718 Sco.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-22 4119.

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

Location of V718 Scorpii

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For V718 Scorpii, the location is 16h 13m 11.60 and -22° 29` 06.4 .

Proper Motion of V718 Scorpii

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 -27.02 ± 0.48 miliarcseconds/year towards the north and -7.98 ± 0.87 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -0.60000 km/s with an error of about 1.90 km/s .

V718 Scorpii Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 3.76 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of V718 Scorpii

V718 Scorpii has a spectral type of A8III/IV. This means the star is a blue subgiant star. The star is 7,286.00 Parsecs from the Galactic Centre or terms of Light Years is 23,764.26 s. The star has a B-V Colour Index of 0.45 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,500 Kelvin.

V718 Scorpii Radius has been calculated as being 1.65 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,146,909.66.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.48. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V718 Scorpii Apparent and Absolute Magnitudes

V718 Scorpii has an apparent magnitude of 8.83 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 3.25 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.48. 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 V718 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.66 which gave the calculated distance to V718 Scorpii as 425.80 light years away from Earth or 130.55 parsecs. It would take a spaceship travelling at the speed of light, 425.80 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 8.52 which put V718 Scorpii at a distance of 382.82 light years or 117.37 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 7,286.00 Parsecs or 23,764.26 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. V718 Scorpii brightness ranges from a magnitude of 9.106 to a magnitude of 8.866 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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V718 Scorpii Facts

Visual Facts

Primary / Proper / Traditional NameV718 Scorpii
Alternative NamesHD 145718, HIP 79476, BD-22 4119, V718 Sco
Spectral TypeA8III/IV
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue
GalaxyMilky Way
Absolute Magnitude3.25 / 3.48
Visual / Apparent Magnitude8.83
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)16h 13m 11.60
Declination (Dec.)-22° 29` 06.4
Galactic Latitude20.45 degrees
Galactic Longitude352.42 degrees
1997 Distance from Earth7.66 Parallax (milliarcseconds)
 425.80 Light Years
 130.55 Parsecs
2007 Distance from Earth8.52 Parallax (milliarcseconds)
 382.82 Light Years
 117.37 Parsecs
Galacto-Centric Distance23,764.26 Light Years / 7,286.00 Parsecs
Proper Motion Dec.-27.02 ± 0.48 milliarcseconds/year
Proper Motion RA.-7.98 ± 0.87 milliarcseconds/year
B-V Index0.45
Radial Velocity-0.60 ± 1.90 km/s
Semi-Major Axis7188.00
Stellar Luminosity (Lsun)3.76

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.217
Variable Magnitude Range (Brighter - Dimmer)8.866 - 9.106

Estimated Facts

Calculated Effective Temperature6,500 Kelvin

Sources and Links

SIMBAD SourceLink

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