Universe Guide

122 G. Aql - HD192086 - HIP99624

122 G. Aql is an orange to red that can be located in the constellation of Aquila. HIP99624 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD192086. The Id of the star in the Gould Star Catalogue is 122. 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. 122 G. Aql has alternative name(s), NSV_12900.

Location of 122 G. Aql

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 122 G. Aql, the location is 20h 13m 04.43 and -00d19`50.9 .

Proper Motion of 122 G. Aql

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 000.48 ± 000.21 towards the north and -010.29 ± 000.45 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 122 G. Aql

122 G. Aql has a spectral type of K5. This means the star is an orange to red coloured . The star has a B-V Colour Index of 1.53 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,949 Kelvin.

122 G. Aql has been calculated as 53.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 37,018,877.01.km.

122 G. Aql Apparent and Absolute Magnitudes

122 G. Aql has an apparent magnitude of 6.47 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 -1.94 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.06. 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 122 G. Aql

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.08 which gave the calculated distance to 122 G. Aql as 1568.09 light years away from Earth or 480.77 parsecs. In 2007, Hipparcos data was revised with a new parallax of 4.94 which put 122 G. Aql at a distance of 660.25 light years or 202.43 parsecs.

It would take a spaceship travelling at the speed of light, 1568.09 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet. 122 G. Aql brightness ranges from a magnitude of 7.000 to a magnitude of 7.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

122 G. Aql Facts


Traditional Name122 G. Aql
Short NameNSV 12900
Hipparcos Library I.D.99624
Bonner DurchmusterungBD-00 3942
Gould I.D.122
Henry Draper Designation192086
Celestial TypeStar
Absolute Magnitude-1.94 / -0.06
Apparent Magnitude6.47
Right Ascension (R.A.)20h 13m 04.43
Declination (Dec.)-00d19`50.9
1997 Distance from Earth2.08 Parallax (milliarcseconds)
 1568.09 Light Years
 480.77 Parsecs
2007 Distance from Earth4.94 Parallax (milliarcseconds)
 660.25 Light Years
 202.43 Parsecs
Proper Motion Dec.0.48 ± 0.21 milliarcseconds/year
Proper Motion RA.-10.29 ± 0.45 milliarcseconds/year
B-V Index1.53
Spectral TypeK5
Colour(K) Orange to Red
Radius (x the Sun)53.20
Calculated Effective Temperature3,949 Kelvin


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