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Chi Aquilae (47 Aquilae A) Star Facts

Chi Aquilae Facts

Chi Aquilae's Alternative Names

Chi Aquilae (Chi Aql) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR7497. HIP96957 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD186203.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 47 Aquilae A with it shortened to 47 Aql A.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+11 3955.

More details on objects' alternative names can be found at Star Names .

Location of Chi Aquilae

The location of the main sequence star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For Chi Aquilae, the location is 19h 42m 34.01 and +11° 49` 35.8 .

Radial Velocity and Proper Motion of Chi Aquilae

Proper Motion

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 -10.11 ± 0.26 milliarcseconds/year towards the north and 1.75 ± 0.51 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -19.00 km/s with an error of about 0.20 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Chi Aquilae 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 452.37 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Chi Aquilae

Chi Aquilae Colour and Temperature

Chi Aquilae has a spectral type of F3V:+.... This means the star is a yellow to white main sequence star. The star has a B-V Colour Index of 0.57 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,006 Kelvin.

Chi Aquilae Radius

Radius has been calculated as being 17.45 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 12,140,377.62.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 19.85. 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 -0.39 with an error value of 0.08 Fe/H with the Sun has a value of 1 to put it into context.

Chi Aquilae Apparent and Absolute Magnitudes

Chi Aquilae has an apparent magnitude of 5.28 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 -1.81. 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 Chi Aquilae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.34 which gave the calculated distance to Chi Aquilae as 751.53 light years away from Earth or 230.41 parsecs. If you want that in miles, it is 5,019,346,702,385,353.19.

In 2007, Hipparcos data was revised with a new parallax of 3.82 which put Chi Aquilae at a distance of 853.83 light years or 261.78 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.

Using the 2007 distance, the star is roughly 53,995,624.73 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,237.00 Parsecs or 23,604.44 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Time to Travel to Chi Aquilae

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 36,816,361,055,905.59 hours or 4,202,780,942.45 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to Chi Aquilae then it would take 133,877,676,566.93 hours / 15,282,839.79 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 751.53 years 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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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Additional Chi Aquilae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameChi Aquilae
Alternative NamesChi Aql, HD 186203, HIP 96957, HR 7497, 47 Aquilae A, 47 Aql A, BD+11 3955
Spectral TypeF3V:+...
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
ConstellationAquila
Absolute Magnitude -1.53 / -1.81
Visual / Apparent Magnitude5.28
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 42m 34.01
Declination (Dec.)+11° 49` 35.8
Galactic Latitude-5.70 degrees
Galactic Longitude49.34 degrees
1997 Distance from Earth4.34 Parallax (milliarcseconds)
 751.53 Light Years
 230.41 Parsecs
2007 Distance from Earth3.82 Parallax (milliarcseconds)
 853.83 Light Years
 261.78 Parsecs
 53,995,624.73 Astronomical Units
Galacto-Centric Distance23,604.44 Light Years / 7,237.00 Parsecs
Proper Motion Dec.-10.11 ± 0.26 milliarcseconds/year
Proper Motion RA.1.75 ± 0.51 milliarcseconds/year
B-V Index0.57
Radial Velocity-19.00 ± 0.20 km/s
Iron Abundance-0.39 ± 0.08 Fe/H
Eccentricity0.08
Semi-Major Axis6701.00
Stellar Luminosity (Lsun)452.37

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)19.85
Effective Temperature6,006 Kelvin

Sources and Links


SIMBAD SourceLink

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
186203+11 3955.0A5.600008.00000-3.00000F5Yellow/White
186204B6.800001958
C12.300001912
D10.300001941
DE11.500001924

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