Universe Guide

145 G. Aql - HD196426 - HIP101746

145 G. Aql is a blue giant star that can be located in the constellation of Aquila. HIP101746 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD196426. The Id of the star in the Gould Star Catalogue is 145. 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 145 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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 145 G. Aql, the location is 20h 37m 18.38 and +00 d 05`49.2 .

Proper Motion of 145 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 -012.00 ± 000.00 towards the north and 004.00 ± 000.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 145 G. Aql

145 G. Aql has a spectral type of B8IIIp. This means the star is a blue coloured giant star. 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.

145 G. Aql has been calculated as 3.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,113,156.50.km.

145 G. Aql Apparent and Absolute Magnitudes

145 G. Aql 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 -0.30 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.10. 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 145 G. Aql

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.00 which gave the calculated distance to 145 G. Aql as 652.33 light years away from us or 200 parsecs. In 2007, Hipparcos data was revised with a new parallax of 6.00 which put 145 G. Aql at a distance of 543.61 light years or 166.67 parsecs.

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.

145 G. Aql Facts


Traditional Name145 G. Aql
Hipparcos Library I.D.101746
Gould I.D.145
Henry Draper Designation196426
Celestial TypeStar
Absolute Magnitude-0.30 / 0.10
Apparent Magnitude6.21
Right Ascension (R.A.)20h 37m 18.38
Declination (Dec.)+00 d 05`49.2
1997 Distance5.00 Parallax (milliarcseconds)
 652.33 Light Years
 200 Parsecs
2007 Distance6.00 Parallax (milliarcseconds)
 543.61 Light Years
 166.67 Parsecs
Proper Motion Dec.-12.00 ± 0.00 milliarcseconds/year
Proper Motion RA.4.00 ± 0.00 milliarcseconds/year
B-V Index-0.07
Spectral TypeB8IIIp
Colour(B) blue
Star Typegiant star
Radius (x the Sun)3.04
Calculated Effective Temperature10,845 Kelvin


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