Universe Guide

108 Aquarii - HD223640 - HIP117629

108 Aquarii is a blue rotating less luminour star that can be located in the constellation of Aquarius. HIP is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD. The Id of the star in the Gould Star Catalogue is . 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. 108 Aquarii has alternative name(s), 108 Aquarii.

Location of 108 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 108 Aquarii, the location is 23h 51m 21.32 and -18 d 54`33.0 .

Physical Properties/View of 108 Aquarii

108 Aquarii has a spectral type of Ap Si. This means the star is (A) blue coloured 108 Aquarii lies at a distance of 321.03 light years away from our Sun and our planet Earth or to put it another way, 98.42 parsecs away from the Sun.

108 Aquarii has an apparent magnitude of 5.17 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 108 Aquarii has an absolute magnitude of 0.20 which is the apparent magnitude of an object if it were 32.6 light years away or 10 parsecs from Earth. 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. The star's temperature has been calculated at being about 13,000 Kelvin. (Based on the b-v value of -0.12 and the lookup on SDSS.)

108 Aquarii Radius has been calculated as being 1.68 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,168,151.50. km.

Variable Type of 108 Aquarii

The star is a rotating Alpha2 Canum Venaticorum variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. 108 Aquarii brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 4.0 days (variability).

Source of Information

The source of the information came 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.

108 Aquarii Facts


Traditional Name108 Aquarii
Short NameET Aqr
Alternative Name(s)108 Aquarii
Hipparcos Library I.D.117629
Gould I.D.270
Henry Draper Designation223640
Celestial TypeStar
Absolute Magnitude0.20
Apparent Magnitude5.17
Right Ascension (R.A.)23h 51m 21.32
Declination (Dec.)-18 d 54`33.0
Distance from the Sun / Earth321.03 Light Years
Spectral TypeAp Si
Colour (A) blue
Star Type Undetermined
Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days4.000
Variable Magnitude Range (Brighter - Dimmer)5.000 - 5.000
Radius (x the Sun)1.68
Calculated Temperature Range7,500.00 - 10,000.00


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