Universe Guide


104 Aquarii - HD222574 - HIP116901

104 Aquarii is a white to yellow luminous giant star that can be located in the constellation of Aquarius. HIP116901 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD222574. The Id of the star in the Gould Star Catalogue is 257. 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. 104 Aquarii has alternative name(s), 104 Aquarii , 104 Aqr.

Location of 104 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 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 104 Aquarii, the location is 23h 41m 45.80 and -17d48`59.5 .

Proper Motion of 104 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 000.94 ± 000.15 towards the north and 014.18 ± 000.25 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 104 Aquarii

104 Aquarii has a spectral type of G2Ib/II. This means the star is a white to yellow coloured luminous giant star. The star has a B-V Colour Index of 0.82 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,376 Kelvin.

104 Aquarii has been calculated as 23.01 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 16,013,472.16.km.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, 104 Aquarii B.

104 Aquarii Apparent and Absolute Magnitudes

104 Aquarii has an apparent magnitude of 4.82 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 -1.65 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.23. 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 104 Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.07 which gave the calculated distance to 104 Aquarii as 643.32 light years away from Earth or 197.24 parsecs. In 2007, Hipparcos data was revised with a new parallax of 3.89 which put 104 Aquarii at a distance of 838.47 light years or 257.07 parsecs.

It would take a spaceship travelling at the speed of light, 643.32 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.

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104 Aquarii Facts

Alternative Names

Traditional Name104 Aquarii
Short Name104 Aqr
Alternative Name(s)104 Aquarii
Hipparcos Library I.D.116901
Bonner DurchmusterungBD-18 6358
Gould I.D.257
Henry Draper Designation222574

Visual Facts

Star Typeluminous giant star
Absolute Magnitude-1.65 / -2.23
Apparent Magnitude4.82
Right Ascension (R.A.)23h 41m 45.80
Declination (Dec.)-17d48`59.5
1997 Distance from Earth5.07 Parallax (milliarcseconds)
 643.32 Light Years
 197.24 Parsecs
2007 Distance from Earth3.89 Parallax (milliarcseconds)
 838.47 Light Years
 257.07 Parsecs
Proper Motion Dec.0.94 ± 0.15 milliarcseconds/year
Proper Motion RA.14.18 ± 0.25 milliarcseconds/year
B-V Index0.82
Spectral TypeG2Ib/II
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Companion Stars104 Aquarii B

Estimated Facts

Radius (x the Sun)23.01
Calculated Effective Temperature5,376 Kelvin

Sources and Links

SIMBAD SourceLink

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