Universe Guide

11 Arietis - HD12885 - HIP9859

11 Arietis is a blue subgiant star that can be located in the constellation of Aries. HIP9859 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD12885. 11 Arietis has alternative name(s), 11 Arietis , 11 Ari.

Location of 11 Arietis

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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 11 Arietis, the location is 02h 06m 49.22 and +25 d 42 ` 16.5 .

Proper Motion of 11 Arietis

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 -014.00 ± 000.00 towards the north and 019.00 ± 000.00 east if we saw them in the horizon.

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

11 Arietis has a spectral type of B9IV-Vn. This means the star is a blue coloured subgiant star. The star has a B-V Colour Index of -0.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,010 Kelvin.

11 Arietis has been calculated as 6.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,513,727.99.km.

11 Arietis Apparent and Absolute Magnitudes

11 Arietis has an apparent magnitude of 6.01 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 -1.60 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.98. 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 Arietis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.00 which gave the calculated distance to 11 Arietis as 1087.21 light years away from us or 333.33 parsecs. In 2007, Hipparcos data was revised with a new parallax of 4.00 which put 11 Arietis at a distance of 815.41 light years or 250 parsecs.

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 Arietis Facts


Traditional Name11 Arietis
Short Name11 Ari
Alternative Name(s)11 Arietis
Hipparcos Library I.D.9859
Henry Draper Designation12885
Celestial TypeStar
Absolute Magnitude-1.60 / -0.98
Apparent Magnitude6.01
Right Ascension (R.A.)02h 06m 49.22
Declination (Dec.)+25 d 42 ` 16.5
1997 Distance3.00 Parallax (milliarcseconds)
 1087.21 Light Years
 333.33 Parsecs
2007 Distance4.00 Parallax (milliarcseconds)
 815.41 Light Years
 250 Parsecs
Proper Motion Dec.-14.00 ± 0.00 milliarcseconds/year
Proper Motion RA.19.00 ± 0.00 milliarcseconds/year
B-V Index-0.03
Spectral TypeB9IV-Vn
Colour(B) blue
Star Typesubgiant star
Radius (x the Sun)6.49
Calculated Effective Temperature10,010 Kelvin


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