Universe Guide

12 Geminorum - HD43836 - HIP30049

12 Geminorum is a blue luminous giant star that can be located in the constellation of Gemini. HIP30049 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD43836. 12 Geminorum has alternative name(s), 12 Geminorum , 12 Gem.

Location of 12 Geminorum

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 Geminorum, the location is 06h 19m 22.52 and +23d16`28.2 .

Proper Motion of 12 Geminorum

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 -002.07 ± 000.37 towards the north and -001.62 ± 000.61 east if we saw them in the horizon.

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

12 Geminorum has a spectral type of A0II. This means the star is a blue coloured luminous giant star. The star has a B-V Colour Index of 0.44 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,276 Kelvin.

12 Geminorum has been calculated as 37.73 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 26,253,229.80.km.

12 Geminorum Apparent and Absolute Magnitudes

12 Geminorum has an apparent magnitude of 6.95 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 -5.15 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.50. 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 Geminorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.38 which gave the calculated distance to 12 Geminorum as 8583.25 light years away from Earth or 2631.58 parsecs. In 2007, Hipparcos data was revised with a new parallax of 1.29 which put 12 Geminorum at a distance of 2528.40 light years or 775.19 parsecs.

It would take a spaceship travelling at the speed of light, 8583.25 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 Geminorum Facts


Traditional Name12 Geminorum
Short Name12 Gem
Alternative Name(s)12 Geminorum
Hipparcos Library I.D.30049
Bonner DurchmusterungBD+23 1301
Henry Draper Designation43836
Celestial TypeStar
Absolute Magnitude-5.15 / -2.50
Apparent Magnitude6.95
Right Ascension (R.A.)06h 19m 22.52
Declination (Dec.)+23d16`28.2
1997 Distance from Earth0.38 Parallax (milliarcseconds)
 8583.25 Light Years
 2631.58 Parsecs
2007 Distance from Earth1.29 Parallax (milliarcseconds)
 2528.40 Light Years
 775.19 Parsecs
Proper Motion Dec.-2.07 ± 0.37 milliarcseconds/year
Proper Motion RA.-1.62 ± 0.61 milliarcseconds/year
B-V Index0.44
Spectral TypeA0II
Colour(A) blue
Star Typeluminous giant star
Radius (x the Sun)37.73
Calculated Effective Temperature6,276 Kelvin


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