Universe Guide

11 Tauri - HD22805 - HIP17181

11 Tauri is a blue subgiant star that can be located in the constellation of Taurus. HIP17181 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD22805. 11 Tauri has alternative name(s), 11 Tauri , 11 Tau.

Location of 11 Tauri

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 11 Tauri, the location is 03h 40m 46.30 and +25 d 19 ` 46.3 .

Proper Motion of 11 Tauri

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 -015.00 ± 000.00 towards the north and 010.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 11 Tauri

11 Tauri has a spectral type of A2IV. This means the star is a blue coloured subgiant star. The star has a B-V Colour Index of 0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,538 Kelvin.

11 Tauri has been calculated as 4.27 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,969,446.67.km.

11 Tauri Apparent and Absolute Magnitudes

11 Tauri has an apparent magnitude of 6.11 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 0.00 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.34. 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 11 Tauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.00 which gave the calculated distance to 11 Tauri as 543.61 light years away from Earth or 166.67 parsecs. In 2007, Hipparcos data was revised with a new parallax of 7.00 which put 11 Tauri at a distance of 465.95 light years or 142.86 parsecs.

It would take a spaceship travelling at the speed of light, 543.61 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.

11 Tauri Facts


Traditional Name11 Tauri
Short Name11 Tau
Alternative Name(s)11 Tauri
Hipparcos Library I.D.17181
Bonner DurchmusterungBD+24 529
Henry Draper Designation22805
Celestial TypeStar
Absolute Magnitude0.00 / 0.34
Apparent Magnitude6.11
Right Ascension (R.A.)03h 40m 46.30
Declination (Dec.)+25 d 19 ` 46.3
1997 Distance from Earth6.00 Parallax (milliarcseconds)
 543.61 Light Years
 166.67 Parsecs
2007 Distance from Earth7.00 Parallax (milliarcseconds)
 465.95 Light Years
 142.86 Parsecs
Proper Motion Dec.-15.00 ± 0.00 milliarcseconds/year
Proper Motion RA.10.00 ± 1.00 milliarcseconds/year
B-V Index0.09
Spectral TypeA2IV
Colour(A) blue
Star Typesubgiant star
Radius (x the Sun)4.27
Calculated Effective Temperature8,538 Kelvin


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