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Al Thalimain, Iota Aquilae, 41 Aquilae, HD184930, HIP96468, HR7447

Al Thalimain (Iota Aquilae) is a blue giant star that can be located in the constellation of Aquila. Al Thalimain is the brightest star in Aquila based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Iota Aquilae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR7447. HIP96468 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD184930. The Id of the star in the Gould Star Catalogue is 64. 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.

The Name `Al Thalimain` is also shared with Lambda Aquilae so if this doesn`t answer your question, then page probably will.

Location of Al Thalimain

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 Al Thalimain, the location is 19h 36m 43.28 and -01d 17` 11.6 .

Proper Motion of Al Thalimain

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 -20.39 ± 0.39 miliarcseconds/year towards the north and -0.87 ± 0.79 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 -21.40000 km/s with an error of about 4.10 km/s .

Physical Properties (Colour, Temperature, Radius) of Al Thalimain

Al Thalimain has a spectral type of B5III. This means the star is a blue giant star. The star is 7307.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23832.7555460800000000s. 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.

Al Thalimain Radius has been calculated as being 3.35 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,327,736.01.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.25. 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 0.09 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

Al Thalimain Apparent and Absolute Magnitudes

Al Thalimain has an apparent magnitude of 4.36 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 -0.51 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.03. 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 Al Thalimain

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.61 which gave the calculated distance to Al Thalimain as 307.41 light years away from Earth or 94.25 parsecs. It would take a spaceship travelling at the speed of light, 307.41 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 8.34 which put Al Thalimain at a distance of 391.08 light years or 119.90 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 7,307.00 Parsecs or 23,832.76 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.

Al Thalimain Facts

Alternative Names

Traditional/Proper NameAl Thalimain
Flamsteed Name41 Aquilae
Flamsteed Short Name41 Aql
Bayer DesignationIota Aquilae
Hipparcos Library I.D.96468
Yale Bright Star Catalogue (HR) Id7447
Bonner DurchmusterungBD-01 3782
Gould I.D.64
Henry Draper Designation184930

Visual Facts

Star Typegiant star
Absolute Magnitude-0.51 / -1.03
Visual / Apparent Magnitude4.36
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 36m 43.28
Declination (Dec.)-01d 17` 11.6
Galactic Latitude-10.66 degrees
Galactic Longitude36.99 degrees
1997 Distance from Earth10.61 Parallax (milliarcseconds)
 307.41 Light Years
 94.25 Parsecs
2007 Revised Distance from Earth8.34 Parallax (milliarcseconds)
 391.08 Light Years
 119.90 Parsecs
Galacto-Centric Distance23,832.76 Light Years / 7,307.00 Parsecs
Proper Motion Dec.-20.39 ± 0.39 milliarcseconds/year
Proper Motion RA.-0.87 ± 0.79 milliarcseconds/year
B-V Index-0.07
Radial Velocity-21.40 ± 4.10 km/s
Iron Abundance0.09 ± 0.04 Fe/H
Spectral TypeB5III
Colour(B) blue

Estimated Facts

Calculated Effective Temperature10,845 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
184930-01 3782.0A4.30000-1.00000-26.00000B5Blue/White

Location of Al Thalimain in Aquila

Al Thalimain (Iota Aquilae) Location in Aquila

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

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