Universe Guide

100 Aquarii B - HD222561 - HIP116904

100 Aquarii B is a blue main sequence dwarf star that can be located in the constellation of Aquarius. HIP116904 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD222561. 100 Aquarii B has alternative name(s), 104 Aquarii , 104 Aqr.

Location of 100 Aquarii B

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 Aquarii B, the location is 23h 41m 46.39 and -17 d 47`00.5 .

Proper Motion of 100 Aquarii B

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 -028.00 ± 001.00 towards the north and -028.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 100 Aquarii B

100 Aquarii B has a spectral type of A6V:. 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.

100 Aquarii B has been calculated as 2.31 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,609,673.98.km.

100 Aquarii B Apparent and Absolute Magnitudes

100 Aquarii B has an apparent magnitude of 8.52 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 1.53 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.03. 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 Aquarii B

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.00 which gave the calculated distance to 100 Aquarii B as 815.41 light years away from Earth or 250 parsecs. In 2007, Hipparcos data was revised with a new parallax of 2.00 which put 100 Aquarii B at a distance of 1630.82 light years or 500 parsecs.

It would take a spaceship travelling at the speed of light, 815.41 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet. 100 Aquarii B brightness ranges from a magnitude of 9.000 to a magnitude of 9.000 over its variable period. The smaller the magnitude, the brighter the star.

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 Aquarii B Facts


Traditional Name100 Aquarii B
Short Name104 Aqr
Alternative Name(s)104 Aquarii
Hipparcos Library I.D.116904
Bonner DurchmusterungBD-18 6359
Henry Draper Designation222561
Celestial TypeStar
Absolute Magnitude1.53 / 0.03
Apparent Magnitude8.52
Right Ascension (R.A.)23h 41m 46.39
Declination (Dec.)-17 d 47`00.5
1997 Distance from Earth4.00 Parallax (milliarcseconds)
 815.41 Light Years
 250 Parsecs
2007 Distance from Earth2.00 Parallax (milliarcseconds)
 1630.82 Light Years
 500 Parsecs
Proper Motion Dec.-28.00 ± 1.00 milliarcseconds/year
Proper Motion RA.-28.00 ± 1.00 milliarcseconds/year
B-V Index0.14
Spectral TypeA6V:
Colour(A) blue
Star Typemain sequence dwarf star
Radius (x the Sun)2.31
Calculated Effective Temperature8,153 Kelvin


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