Universe Guide

13 Trianguli - HD15335 - HIP11548

13 Trianguli is a white to yellow main sequence dwarf star that can be located in the constellation of Triangulum. HIP11548 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD15335. 13 Trianguli has alternative name(s), 13 Trianguli , 13 Tri.

Location of 13 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 13 Trianguli, the location is 02h 28m 48.54 and +29 d 55 ` 53.7 .

Proper Motion of 13 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 072.00 ± 000.00 towards the north and -067.00 ± 000.00 east if we saw them in the horizon.

13 Trianguli Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 1.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 13 Trianguli

13 Trianguli has a spectral type of G0V. This means the star is a white to yellow coloured main sequence dwarf star. The star has a B-V Colour Index of 0.59 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,931 Kelvin.

13 Trianguli has been calculated as 1.83 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,273,791.68.km.

13 Trianguli Apparent and Absolute Magnitudes

13 Trianguli has an apparent magnitude of 5.89 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 3.42 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.42. 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 13 Trianguli

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 32.00 which gave the calculated distance to 13 Trianguli as 101.93 light years away from Earth or 31.25 parsecs. In 2007, Hipparcos data was revised with a new parallax of 32.00 which put 13 Trianguli at a distance of 101.93 light years or 31.25 parsecs.

It would take a spaceship travelling at the speed of light, 101.93 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.

13 Trianguli Facts


Traditional Name13 Trianguli
Short Name13 Tri
Alternative Name(s)13 Trianguli
Hipparcos Library I.D.11548
Bonner DurchmusterungBD+29 423
Henry Draper Designation15335
Celestial TypeStar
Absolute Magnitude3.42 / 3.42
Apparent Magnitude5.89
Right Ascension (R.A.)02h 28m 48.54
Declination (Dec.)+29 d 55 ` 53.7
1997 Distance from Earth32.00 Parallax (milliarcseconds)
 101.93 Light Years
 31.25 Parsecs
2007 Distance from Earth32.00 Parallax (milliarcseconds)
 101.93 Light Years
 31.25 Parsecs
Proper Motion Dec.72.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-67.00 ± 0.00 milliarcseconds/year
B-V Index0.59
Spectral TypeG0V
Colour(G) White to Yellow
Star Typemain sequence dwarf star
Radius (x the Sun)1.83
Luminosity (x the Sun)1.0000000
Calculated Effective Temperature5,931 Kelvin


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