Universe Guide

12 Virginis - HD106251 - HIP59608

12 Virginis is a blue that can be located in the constellation of Virgo. HIP59608 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD106251. 12 Virginis has alternative name(s), 12 Virginis , 12 Vir.

Location of 12 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 12 Virginis, the location is 12h 13m 25.99 and +10d15`44.5 .

Proper Motion of 12 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 -007.65 ± 000.19 towards the north and -093.46 ± 000.29 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 12 Virginis

12 Virginis has a spectral type of A2m. This means the star is a blue coloured . The star has a B-V Colour Index of 0.26 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,999 Kelvin.

12 Virginis has been calculated as 1.32 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 917,454.74.km.

12 Virginis Apparent and Absolute Magnitudes

12 Virginis has an apparent magnitude of 5.85 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 2.37 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.35. 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 12 Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 20.18 which gave the calculated distance to 12 Virginis as 161.63 light years away from Earth or 49.55 parsecs. In 2007, Hipparcos data was revised with a new parallax of 19.93 which put 12 Virginis at a distance of 163.65 light years or 50.18 parsecs.

It would take a spaceship travelling at the speed of light, 161.63 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.

12 Virginis Facts

Traditional Name12 Virginis
Short Name12 Vir
Alternative Name(s)12 Virginis
Hipparcos Library I.D.59608
Bonner DurchmusterungBD+11 2440
Henry Draper Designation106251
Celestial TypeStar
Absolute Magnitude2.37 / 2.35
Apparent Magnitude5.85
Right Ascension (R.A.)12h 13m 25.99
Declination (Dec.)+10d15`44.5
1997 Distance from Earth20.18 Parallax (milliarcseconds)
 161.63 Light Years
 49.55 Parsecs
2007 Distance from Earth19.93 Parallax (milliarcseconds)
 163.65 Light Years
 50.18 Parsecs
Proper Motion Dec.-7.65 ± 0.19 milliarcseconds/year
Proper Motion RA.-93.46 ± 0.29 milliarcseconds/year
B-V Index0.26
Spectral TypeA2m
Colour(A) blue
Radius (x the Sun)1.32
Calculated Effective Temperature6,999 Kelvin

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