Universe Guide

11 G. Cet - HD319 - HIP636

11 G. Cet is a blue main sequence dwarf star that can be located in the constellation of Cetus. HIP636 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD319. The Id of the star in the Gould Star Catalogue is 11. 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.

Location of 11 G. Cet

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 G. Cet, the location is 00h 07m 46.86 and -22 d 30`30.5 .

Proper Motion of 11 G. Cet

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 -035.00 ± 000.00 towards the north and 069.00 ± 000.00 east if we saw them in the horizon.

11 G. Cet Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 20.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 11 G. Cet

11 G. Cet has a spectral type of A1V. This means the star is a blue coloured main sequence dwarf star. The star has a B-V Colour Index of 0.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,153 Kelvin.

11 G. Cet has been calculated as 2.54 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,764,980.41.km.

11 G. Cet Apparent and Absolute Magnitudes

11 G. Cet has an apparent magnitude of 5.93 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 1.33 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.50. 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 G. Cet

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.00 which gave the calculated distance to 11 G. Cet as 271.80 light years away from us or 83.33 parsecs. In 2007, Hipparcos data was revised with a new parallax of 13.00 which put 11 G. Cet at a distance of 250.89 light years or 76.92 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 G. Cet Facts


Traditional Name11 G. Cet
Hipparcos Library I.D.636
Gould I.D.11
Henry Draper Designation319
Celestial TypeStar
Absolute Magnitude1.33 / 1.50
Apparent Magnitude5.93
Right Ascension (R.A.)00h 07m 46.86
Declination (Dec.)-22 d 30`30.5
1997 Distance12.00 Parallax (milliarcseconds)
 271.80 Light Years
 83.33 Parsecs
2007 Distance13.00 Parallax (milliarcseconds)
 250.89 Light Years
 76.92 Parsecs
Proper Motion Dec.-35.00 ± 0.00 milliarcseconds/year
Proper Motion RA.69.00 ± 0.00 milliarcseconds/year
B-V Index0.14
Spectral TypeA1V
Colour(A) blue
Star Typemain sequence dwarf star
Radius (x the Sun)2.54
Luminosity (x the Sun)20.0000000
Calculated Effective Temperature8,153 Kelvin


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