Universe Guide


13 Virginis - HD107070 - HIP60030

13 Virginis is a blue main sequence dwarf star that can be located in the constellation of Virgo. HIP60030 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD107070. The Id of the star in the Gould Star Catalogue is 43. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. 13 Virginis has alternative name(s), 13 Virginis , 13 Vir.

Location of 13 Virginis

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 13 Virginis, the location is 12h 18m 40.30 and -00d47`13.7 .

Proper Motion of 13 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 -016.50 ± 000.17 towards the north and 033.84 ± 000.29 east if we saw them in the horizon.

13 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 11.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 13 Virginis

13 Virginis has a spectral type of A5Vn. This means the star is a blue coloured main sequence dwarf star. The star has a B-V Colour Index of 0.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,017 Kelvin.

13 Virginis has been calculated as 3.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,225,129.17.km.

13 Virginis Apparent and Absolute Magnitudes

13 Virginis has an apparent magnitude of 5.90 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 0.9 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.61. 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 13 Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.00 which gave the calculated distance to 13 Virginis as 326.16 light years away from Earth or 100 parsecs. In 2007, Hipparcos data was revised with a new parallax of 8.73 which put 13 Virginis at a distance of 373.61 light years or 114.55 parsecs.

It would take a spaceship travelling at the speed of light, 326.16 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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13 Virginis Facts

Alternative Names

Traditional Name13 Virginis
Short Name13 Vir
Alternative Name(s)13 Virginis
Hipparcos Library I.D.60030
Bonner DurchmusterungBD+00 2920
Gould I.D.43
Henry Draper Designation107070

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude0.9 / 0.61
Apparent Magnitude5.90
Right Ascension (R.A.)12h 18m 40.30
Declination (Dec.)-00d47`13.7
1997 Distance from Earth10.00 Parallax (milliarcseconds)
 326.16 Light Years
 100 Parsecs
2007 Distance from Earth8.73 Parallax (milliarcseconds)
 373.61 Light Years
 114.55 Parsecs
Proper Motion Dec.-16.50 ± 0.17 milliarcseconds/year
Proper Motion RA.33.84 ± 0.29 milliarcseconds/year
B-V Index0.16
Spectral TypeA5Vn
Colour(A) blue

Estimated Facts

Radius (x the Sun)3.20
Luminosity (x the Sun)11.0000000
Calculated Effective Temperature8,017 Kelvin

Sources and Links

SIMBAD SourceLink

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