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Iota Aquarii - HD209819 - HIP109139

Iota Aquarii is a blue main sequence dwarf star that can be located in the constellation of Aquarius. Iota Aquarii is the Bayer Classification for the star. HIP109139 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD209819. The Id of the star in the Gould Star Catalogue is 107. 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. Iota Aquarii has alternative name(s), 33 Aquarii , 33 Aqr.

Location of Iota 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 Iota Aquarii, the location is 22h 06m 26.21 and -13d52`10.3 .

Proper Motion of Iota 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 -058.99 ± 000.11 towards the north and 036.89 ± 000.22 east if we saw them in the horizon.

Iota Aquarii 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 73.0000000 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 Iota Aquarii

Iota Aquarii has a spectral type of B8V. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of -0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,845 Kelvin.

Iota Aquarii has been calculated as 1.94 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,351,830.19.km.

Iota Aquarii Apparent and Absolute Magnitudes

Iota Aquarii has an apparent magnitude of 4.29 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 0.67 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.64. 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 Iota Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 18.90 which gave the calculated distance to Iota Aquarii as 172.57 light years away from Earth or 52.91 parsecs. It would take a spaceship travelling at the speed of light, 172.57 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 18.62 which put Iota Aquarii at a distance of 175.17 light years or 53.71 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Meteor Showers Radiating from near Iota Aquarii

The Northern Iota Aquariids Meteor Shower radiants from a point near this star. The meteor shower runs typically between Aug 11-Sep 10 with a peak date of Aug. 25/26. The speed of a meteor in the shower is 31 Km/s.

The Southern Iota Aquariids Meteor Shower radiants from a point near this star. The meteor shower runs typically between July 1-September 18 with a peak date of Aug. 6/7.

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.

Iota Aquarii Facts

Alternative Names

Short Name33 Aqr
Bayer DesignationIota Aquarii
Alternative Name(s)33 Aquarii
Hipparcos Library I.D.109139
Bonner DurchmusterungBD-14 6209
Gould I.D.107
Henry Draper Designation209819

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude0.67 / 0.64
Apparent Magnitude4.29
Right Ascension (R.A.)22h 06m 26.21
Declination (Dec.)-13d52`10.3
1997 Distance from Earth18.90 Parallax (milliarcseconds)
 172.57 Light Years
 52.91 Parsecs
2007 Revised Distance from Earth18.62 Parallax (milliarcseconds)
 175.17 Light Years
 53.71 Parsecs
Proper Motion Dec.-58.99 ± 0.11 milliarcseconds/year
Proper Motion RA.36.89 ± 0.22 milliarcseconds/year
B-V Index-0.07
Spectral TypeB8V
Colour(B) blue

Estimated Facts

Radius (x the Sun)1.94
Luminosity (x the Sun)73.0000000
Calculated Effective Temperature10,845 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Iota Aquarii in Aquarius


Iota Aquarii (Iota Aquarii) Location in Aquarius

The map was generated using Night Vision, an awesome free application by Brian Simpson.


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