Universe Guide

11 Bootis - HD122405 - HIP68478

11 Bootis is a blue giant star that can be located in the constellation of Bootes. HIP68478 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD122405. 11 Bootis has alternative name(s), 11 Bootis , 11 Boo.

Location of 11 Bootis

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 Bootis, the location is 14h 01m 10.53 and +27 d 23 ` 11.6 .

Proper Motion of 11 Bootis

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 020.00 ± 000.00 towards the north and -080.00 ± 000.00 east if we saw them in the horizon.

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

11 Bootis has a spectral type of A7III. This means the star is a blue coloured giant star. The star has a B-V Colour Index of 0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,827 Kelvin.

11 Bootis has been calculated as 2.88 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,005,326.47.km.

11 Bootis Apparent and Absolute Magnitudes

11 Bootis has an apparent magnitude of 6.23 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 1.23 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.44. 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 Bootis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.00 which gave the calculated distance to 11 Bootis as 326.16 light years away from Earth or 100 parsecs. In 2007, Hipparcos data was revised with a new parallax of 11.00 which put 11 Bootis at a distance of 296.51 light years or 90.91 parsecs.

It would take a spaceship travelling at the speed of light, 326.16 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 Bootis Facts


Traditional Name11 Bootis
Short Name11 Boo
Alternative Name(s)11 Bootis
Hipparcos Library I.D.68478
Bonner DurchmusterungBD+28 2287
Henry Draper Designation122405
Celestial TypeStar
Absolute Magnitude1.23 / 1.44
Apparent Magnitude6.23
Right Ascension (R.A.)14h 01m 10.53
Declination (Dec.)+27 d 23 ` 11.6
1997 Distance from Earth10.00 Parallax (milliarcseconds)
 326.16 Light Years
 100 Parsecs
2007 Distance from Earth11.00 Parallax (milliarcseconds)
 296.51 Light Years
 90.91 Parsecs
Proper Motion Dec.20.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-80.00 ± 0.00 milliarcseconds/year
B-V Index0.19
Spectral TypeA7III
Colour(A) blue
Star Typegiant star
Radius (x the Sun)2.88
Calculated Effective Temperature7,827 Kelvin


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