Universe Guide

12 Aquilae - HD176678 - HIP93429

12 Aquilae is an orange to red giant star that can be located in the constellation of Aquila. HIP93429 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD176678. The Id of the star in the Gould Star Catalogue is 9. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. 12 Aquilae has alternative name(s), 12 Aquilae , 12 Aql.

Location of 12 Aquilae

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 Aquilae, the location is 19h 01m 40.84 and -05 d 44 ` 20.5 .

Proper Motion of 12 Aquilae

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 -040.00 ± 000.00 towards the north and -024.00 ± 000.00 east if we saw them in the horizon.

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

12 Aquilae has a spectral type of K1IIIvar. This means the star is an orange to red coloured giant star. The star has a B-V Colour Index of 1.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,718 Kelvin.

12 Aquilae has been calculated as 9.99 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,948,079.68.km.

12 Aquilae Apparent and Absolute Magnitudes

12 Aquilae has an apparent magnitude of 4.02 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 0.73 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.83. 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 Aquilae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 22.00 which gave the calculated distance to 12 Aquilae as 148.26 light years away from Earth or 45.45 parsecs. In 2007, Hipparcos data was revised with a new parallax of 23.00 which put 12 Aquilae at a distance of 141.81 light years or 43.48 parsecs.

It would take a spaceship travelling at the speed of light, 148.26 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.

12 Aquilae Facts


Traditional Name12 Aquilae
Short Name12 Aql
Alternative Name(s)12 Aquilae
Hipparcos Library I.D.93429
Bonner DurchmusterungBD-05 4840
Gould I.D.9
Henry Draper Designation176678
Celestial TypeStar
Absolute Magnitude0.73 / 0.83
Apparent Magnitude4.02
Right Ascension (R.A.)19h 01m 40.84
Declination (Dec.)-05 d 44 ` 20.5
1997 Distance from Earth22.00 Parallax (milliarcseconds)
 148.26 Light Years
 45.45 Parsecs
2007 Distance from Earth23.00 Parallax (milliarcseconds)
 141.81 Light Years
 43.48 Parsecs
Proper Motion Dec.-40.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-24.00 ± 0.00 milliarcseconds/year
B-V Index1.07
Spectral TypeK1IIIvar
Colour(K) Orange to Red
Star Typegiant star
Radius (x the Sun)9.99
Calculated Effective Temperature4,718 Kelvin


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