Universe Guide

12 Monocerotis - HD46241 - HIP31159

12 Monocerotis is an orange to red main sequence dwarf star that can be located in the constellation of Monoceros. HIP31159 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD46241. 12 Monocerotis has alternative name(s), 12 Monocerotis , 12 Mon.

Location of 12 Monocerotis

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 Monocerotis, the location is 06h 32m 19.23 and +04d51`21.6 .

Proper Motion of 12 Monocerotis

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 001.11 ± 000.43 towards the north and -037.13 ± 000.54 east if we saw them in the horizon.

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

12 Monocerotis has a spectral type of K0V. This means the star is an orange to red coloured main sequence dwarf star. The star has a B-V Colour Index of 0.99 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,868 Kelvin.

12 Monocerotis has been calculated as 11.97 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,331,564.86.km.

12 Monocerotis Apparent and Absolute Magnitudes

12 Monocerotis has an apparent magnitude of 5.88 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 -0.12 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.30. 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 Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.30 which gave the calculated distance to 12 Monocerotis as 517.72 light years away from Earth or 158.73 parsecs. In 2007, Hipparcos data was revised with a new parallax of 5.80 which put 12 Monocerotis at a distance of 562.35 light years or 172.41 parsecs.

It would take a spaceship travelling at the speed of light, 517.72 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 Monocerotis Facts


Traditional Name12 Monocerotis
Short Name12 Mon
Alternative Name(s)12 Monocerotis
Hipparcos Library I.D.31159
Bonner DurchmusterungBD+04 1304
Henry Draper Designation46241
Celestial TypeStar
Absolute Magnitude-0.12 / -0.30
Apparent Magnitude5.88
Right Ascension (R.A.)06h 32m 19.23
Declination (Dec.)+04d51`21.6
1997 Distance from Earth6.30 Parallax (milliarcseconds)
 517.72 Light Years
 158.73 Parsecs
2007 Distance from Earth5.80 Parallax (milliarcseconds)
 562.35 Light Years
 172.41 Parsecs
Proper Motion Dec.1.11 ± 0.43 milliarcseconds/year
Proper Motion RA.-37.13 ± 0.54 milliarcseconds/year
B-V Index0.99
Spectral TypeK0V
Colour(K) Orange to Red
Star Typemain sequence dwarf star
Radius (x the Sun)11.97
Calculated Effective Temperature4,868 Kelvin


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