Universe Guide

136 G. Aql - HD194263 - HIP100672

136 G. Aql is an orange to red eruptive that can be located in the constellation of Aquila. HIP100672 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD194263. The Id of the star in the Gould Star Catalogue is 136. 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 136 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 136 G. Aql, the location is 20h 24m 41.75 and +01 d 22`07.0 .

Proper Motion of 136 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 -020.00 ± 000.00 towards the north and 007.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 136 G. Aql

136 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 1.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,775 Kelvin.

136 G. Aql has been calculated as 28.52 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,840,819.79.km.

136 G. Aql Apparent and Absolute Magnitudes

136 G. Aql has an apparent magnitude of 6.41 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 -0.58 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.58. 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 136 G. Aql

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.00 which gave the calculated distance to 136 G. Aql as 815.41 light years away from Earth or 250 parsecs. In 2007, Hipparcos data was revised with a new parallax of 4.00 which put 136 G. Aql at a distance of 815.41 light years or 250 parsecs.

It would take a spaceship travelling at the speed of light, 815.41 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of 136 G. Aql

The star is a eruptive Irregular variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. 136 G. Aql brightness ranges from a magnitude of 7.000 to a magnitude of 6.000 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.

136 G. Aql Facts


Traditional Name136 G. Aql
Hipparcos Library I.D.100672
Bonner DurchmusterungBD+00 4496
Gould I.D.136
Henry Draper Designation194263
Celestial TypeStar
Absolute Magnitude-0.58 / -0.58
Apparent Magnitude6.41
Right Ascension (R.A.)20h 24m 41.75
Declination (Dec.)+01 d 22`07.0
1997 Distance from Earth4.00 Parallax (milliarcseconds)
 815.41 Light Years
 250 Parsecs
2007 Distance from Earth4.00 Parallax (milliarcseconds)
 815.41 Light Years
 250 Parsecs
Proper Motion Dec.-20.00 ± 0.00 milliarcseconds/year
Proper Motion RA.7.00 ± 1.00 milliarcseconds/year
B-V Index1.60
Spectral TypeK5
Colour(K) Orange to Red
Variable Star ClassEruptive
Variable Star TypeIrregular
Variable Magnitude Range (Brighter - Dimmer)6.000 - 7.000
Radius (x the Sun)28.52
Calculated Effective Temperature3,775 Kelvin


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