Universe Guide


12 Trianguli - HD15257 - HIP11486

12 Trianguli is a blue to white giant star that can be located in the constellation of Triangulum. HIP11486 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD15257. 12 Trianguli has alternative name(s), 12 Trianguli , 12 Tri.

Location of 12 Trianguli

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 Trianguli, the location is 02h 28m 09.99 and +29d40`10.3 .

Proper Motion of 12 Trianguli

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 -085.95 ± 000.14 towards the north and -015.34 ± 000.27 east if we saw them in the horizon.

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

12 Trianguli has a spectral type of F0III. This means the star is a blue to white coloured giant star. The star has a B-V Colour Index of 0.31 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,167 Kelvin.

12 Trianguli has been calculated as 2.52 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,756,686.92.km.

12 Trianguli Apparent and Absolute Magnitudes

12 Trianguli has an apparent magnitude of 5.29 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 1.90 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.80. 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 Trianguli

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 21.01 which gave the calculated distance to 12 Trianguli as 155.24 light years away from Earth or 47.60 parsecs. In 2007, Hipparcos data was revised with a new parallax of 20.07 which put 12 Trianguli at a distance of 162.51 light years or 49.83 parsecs.

It would take a spaceship travelling at the speed of light, 155.24 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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12 Trianguli Facts

Alternative Names

Traditional Name12 Trianguli
Short Name12 Tri
Alternative Name(s)12 Trianguli
Hipparcos Library I.D.11486
Bonner DurchmusterungBD+29 417
Henry Draper Designation15257

Visual Facts

Star Typegiant star
Absolute Magnitude1.90 / 1.80
Apparent Magnitude5.29
Right Ascension (R.A.)02h 28m 09.99
Declination (Dec.)+29d40`10.3
1997 Distance from Earth21.01 Parallax (milliarcseconds)
 155.24 Light Years
 47.60 Parsecs
2007 Distance from Earth20.07 Parallax (milliarcseconds)
 162.51 Light Years
 49.83 Parsecs
Proper Motion Dec.-85.95 ± 0.14 milliarcseconds/year
Proper Motion RA.-15.34 ± 0.27 milliarcseconds/year
B-V Index0.31
Spectral TypeF0III
Colour(F) blue to white

Estimated Facts

Radius (x the Sun)2.52
Calculated Effective Temperature7,167 Kelvin

Sources and Links

SIMBAD SourceLink

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