Universe Guide

100 G. Aqr - HD209240 - HIP108784

100 G. Aqr is an orange to red giant star that can be located in the constellation of Aquarius. HIP108784 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD209240. The Id of the star in the Gould Star Catalogue is 100. 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 100 G. Aqr

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 100 G. Aqr, the location is 22h 02m 11.78 and -17 d 54`12.0 .

Proper Motion of 100 G. Aqr

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 -060.00 ± 000.00 towards the north and 118.00 ± 000.00 east if we saw them in the horizon.

100 G. Aqr 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 96.0000000 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 100 G. Aqr

100 G. Aqr has a spectral type of K0III. This means the star is an orange to red coloured giant star. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,849 Kelvin.

100 G. Aqr has been calculated as 6.10 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,246,850.46.km.

100 G. Aqr Apparent and Absolute Magnitudes

100 G. Aqr has an apparent magnitude of 6.28 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 1.68 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.49. 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 100 G. Aqr

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 100 G. Aqr as 271.80 light years away from Earth or 83.33 parsecs. In 2007, Hipparcos data was revised with a new parallax of 11.00 which put 100 G. Aqr at a distance of 296.51 light years or 90.91 parsecs.

It would take a spaceship travelling at the speed of light, 271.80 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.

100 G. Aqr Facts


Traditional Name100 G. Aqr
Hipparcos Library I.D.108784
Bonner DurchmusterungBD-18 6056
Gould I.D.100
Henry Draper Designation209240
Celestial TypeStar
Absolute Magnitude1.68 / 1.49
Apparent Magnitude6.28
Right Ascension (R.A.)22h 02m 11.78
Declination (Dec.)-17 d 54`12.0
1997 Distance from Earth12.00 Parallax (milliarcseconds)
 271.80 Light Years
 83.33 Parsecs
2007 Distance from Earth11.00 Parallax (milliarcseconds)
 296.51 Light Years
 90.91 Parsecs
Proper Motion Dec.-60.00 ± 0.00 milliarcseconds/year
Proper Motion RA.118.00 ± 0.00 milliarcseconds/year
B-V Index1.00
Spectral TypeK0III
Colour(K) Orange to Red
Star Typegiant star
Radius (x the Sun)6.10
Luminosity (x the Sun)96.0000000
Calculated Effective Temperature4,849 Kelvin


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