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.
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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 12 Geminorum, the location is 06h 19m 22.52 and +23 d 16 ` 28.2 .
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 -002.00 ± 000.00 towards the north and -002.00 ± 001.00 east if we saw them in the horizon.
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 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.05. 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.00 which gave the calculated distance to 12 Geminorum as -1 light years away from us or -1 parsecs. In 2007, Hipparcos data was revised with a new parallax of 1.00 which put 12 Geminorum at a distance of 3261.63 light years or 1000 parsecs.
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.
|Traditional Name||12 Geminorum|
|Short Name||12 Gem|
|Alternative Name(s)||12 Geminorum|
|Hipparcos Library I.D.||30049|
|Henry Draper Designation||43836|
|Right Ascension (R.A.)||06h 19m 22.52|
|Declination (Dec.)||+23 d 16 ` 28.2|
|1997 Distance||0.00 Parallax (milliarcseconds)|
|-1 Light Years|
|2007 Distance||1.00 Parallax (milliarcseconds)|
|3261.63 Light Years|
|Proper Motion Dec.||-2.00 ± 0.00 milliarcseconds/year|
|Proper Motion RA.||-2.00 ± 1.00 milliarcseconds/year|
|Star Type||luminous giant star|
|Calculated Effective Temperature||6,276 Kelvin|