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11 Aquarii, HD199960, HIP103682, HR8041

11 Aquarii is a white to yellow star that can be located in the constellation of Aquarius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 6.30 Billion of Years but could be as young as 4.20 to 7.40 according to Hipparcos.

The Id of the star in the Yale Bright Star Catalogue is HR8041. HIP103682 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD199960. The Id of the star in the Gould Star Catalogue is 31. 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 11 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 11 Aquarii, the location is 21h 00m 33.81 and -04d 43` 47.7 .

Proper Motion of 11 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 -138.84 ± 0.26 miliarcseconds/year towards the north and 48.78 ± 0.58 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -17.57000 km/s with an error of about 0.09 km/s .

11 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 1.0000000 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, Age, Radius) of 11 Aquarii

11 Aquarii has a spectral type of G1V. This means the star is a white to yellow star. The star is 7383.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24080.6396875200000000s. The star has a B-V Colour Index of 0.63 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,789 Kelvin.

11 Aquarii Radius has been calculated as being 1.40 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 977,553.37.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.45. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.22 with an error value of 0.01 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 6.30 Billion years old but could be between 4.20 and 7.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

11 Aquarii Apparent and Absolute Magnitudes

11 Aquarii has an apparent magnitude of 6.21 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 4.10 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.03. 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 11 Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 37.80 which gave the calculated distance to 11 Aquarii as 86.29 light years away from Earth or 26.46 parsecs. It would take a spaceship travelling at the speed of light, 86.29 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 36.73 which put 11 Aquarii at a distance of 88.80 light years or 27.23 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.

The star's Galacto-Centric Distance is 7,383.00 Parsecs or 24,080.64 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

11 Aquarii Facts

Alternative Names

Traditional/Proper Name11 Aquarii
Flamsteed Name11 Aquarii
Flamsteed Short Name11 Aqr
Hipparcos Library I.D.103682
Yale Bright Star Catalogue (HR) Id8041
Bonner DurchmusterungBD-05 5433
Gould I.D.31
Henry Draper Designation199960

Visual Facts

Star Type star
Age6.30 Billion Years Old
Age Range4.20 - 7.40 Billion Years Old
Absolute Magnitude4.10 / 4.03
Visual / Apparent Magnitude6.21
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)21h 00m 33.81
Declination (Dec.)-04d 43` 47.7
Galactic Latitude-30.75 degrees
Galactic Longitude44.29 degrees
1997 Distance from Earth37.80 Parallax (milliarcseconds)
 86.29 Light Years
 26.46 Parsecs
2007 Revised Distance from Earth36.73 Parallax (milliarcseconds)
 88.80 Light Years
 27.23 Parsecs
Galacto-Centric Distance24,080.64 Light Years / 7,383.00 Parsecs
Proper Motion Dec.-138.84 ± 0.26 milliarcseconds/year
Proper Motion RA.48.78 ± 0.58 milliarcseconds/year
B-V Index0.63
Radial Velocity-17.57 ± 0.09 km/s
Iron Abundance0.22 ± 0.01 Fe/H
Spectral TypeG1V
Colour(G) White to Yellow

Estimated Facts

Luminosity (x the Sun)1.0000000
Calculated Effective Temperature5,789 Kelvin

Sources and Links

SIMBAD SourceLink

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