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20 G. Virginis

20 G. Virginis Facts

20 G. Virginis's Alternative Names

HIP58450 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD104078.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 20 G. Virginis. There are no stars with a Gould designation in Ursa Major for example.

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-09 3408.

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

Location of 20 G. Virginis

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 object is compared to the celestial equator and is expressed in degrees. For 20 G. Virginis, the location is 11h 59m 09.38 and -10° 28` 33.5 .

Proper Motion of 20 G. Virginis

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 30.59 ± 0.23 milliarcseconds/year towards the north and -8.98 ± 0.43 milliarcseconds/year east if we saw them in the horizon. . 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.

20 G. Virginis 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 391.71 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 20 G. Virginis

20 G. Virginis Colour and Temperature

20 G. Virginis has a spectral type of K2. This means the star is a orange to red star. The star has a B-V Colour Index of 1.45 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,115 Kelvin.

20 G. Virginis Radius

Radius has been calculated as being 24.44 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 17,008,038.80.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 24.90. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

20 G. Virginis Apparent and Absolute Magnitudes

20 G. Virginis has an apparent magnitude of 6.49 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 -0.62 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.66. 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 20 G. Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.79 which gave the calculated distance to 20 G. Virginis as 860.59 light years away from Earth or 263.85 parsecs. It would take a spaceship travelling at the speed of light, 860.59 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 3.71 which put 20 G. Virginis at a distance of 879.15 light years or 269.54 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 55,596,228.48 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.

The star's Galacto-Centric Distance is 7,368.00 Parsecs or 24,031.72 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 20 G. Virginis Facts and Figures

Visual Facts


Primary / Proper / Traditional Name20 G. Virginis
Alternative NamesHD 104078, HIP 58450, BD-09 3408
Spectral TypeK2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourOrange to Red
GalaxyMilky Way
ConstellationVirgo
Absolute Magnitude -0.62 / -0.66
Visual / Apparent Magnitude6.49
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)11h 59m 09.38
Declination (Dec.)-10° 28` 33.5
Galactic Latitude50.32 degrees
Galactic Longitude282.55 degrees
1997 Distance from Earth3.79 Parallax (milliarcseconds)
 860.59 Light Years
 263.85 Parsecs
2007 Distance from Earth3.71 Parallax (milliarcseconds)
 879.15 Light Years
 269.54 Parsecs
 55,596,228.48 Astronomical Units
Galacto-Centric Distance24,031.72 Light Years / 7,368.00 Parsecs
Proper Motion Dec.30.59 ± 0.23 milliarcseconds/year
Proper Motion RA.-8.98 ± 0.43 milliarcseconds/year
B-V Index1.45
Stellar Luminosity (Lsun)391.71

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)24.90
Effective Temperature4,115 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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