Universe Guide

12 Aquarii - HD200496 - HIP103981

12 Aquarii is a white to yellow less luminous star that can be located in the constellation of Aquarius. HIP103981 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD200496. The Id of the star in the Gould Star Catalogue is 37. 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 Aquarii has alternative name(s), 12 Aquarii , 12 Aqr. 12 Aquarii is a multiple star system with 2 stars orbiting in its solar system.

Location of 12 Aquarii

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 12 Aquarii, the location is 21h 04m 04.71 and -05 d 49 ` 23.0 .

Proper Motion of 12 Aquarii

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 -007.00 ± 000.00 towards the north and 020.00 ± 001.00 east if we saw them in the horizon.

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

12 Aquarii has a spectral type of G4. This means the star is a white to yellow coloured less luminous star. The star has a B-V Colour Index of 0.68 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,694 Kelvin.

12 Aquarii has been calculated as 12.53 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,720,845.63.km.

12 Aquarii Apparent and Absolute Magnitudes

12 Aquarii has an apparent magnitude of 5.53 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 -0.58 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.24. 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 Aquarii

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 12 Aquarii as 543.61 light years away from us or 166.67 parsecs. In 2007, Hipparcos data was revised with a new parallax of 7.00 which put 12 Aquarii at a distance of 465.95 light years or 142.86 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.

12 Aquarii Facts


Traditional Name12 Aquarii
Short Name12 Aqr
Alternative Name(s)12 Aquarii
Hipparcos Library I.D.103981
Gould I.D.37
Henry Draper Designation200496
Celestial TypeStar
Absolute Magnitude-0.58 / -0.24
Apparent Magnitude5.53
Right Ascension (R.A.)21h 04m 04.71
Declination (Dec.)-05 d 49 ` 23.0
1997 Distance6.00 Parallax (milliarcseconds)
 543.61 Light Years
 166.67 Parsecs
2007 Distance7.00 Parallax (milliarcseconds)
 465.95 Light Years
 142.86 Parsecs
Proper Motion Dec.-7.00 ± 0.00 milliarcseconds/year
Proper Motion RA.20.00 ± 1.00 milliarcseconds/year
B-V Index0.68
Spectral TypeG4
Colour(G) White to Yellow
Star Typeless luminous star
Stars in Solar System2
Radius (x the Sun)12.53
Calculated Effective Temperature5,694 Kelvin


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