Universe Guide

109 Herculis - HD169414 - HIP90139

109 Herculis is an orange to red giant star that can be located in the constellation of Hercules. HIP is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD.

Location of 109 Herculis

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 109 Herculis, the location is 18h 23m 41.77 and +21 d 46 ` 13.2 .

Physical Properties/View of 109 Herculis

109 Herculis has a spectral type of K2III. This means the star is (K) orange to red coloured (III) giant. 109 Herculis lies at a distance of 128.41 light years away from our Sun and our planet Earth or to put it another way, 39.24 parsecs away from the Sun.

109 Herculis has an apparent magnitude of 3.85 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 109 Herculis has an absolute magnitude of 0.87 which is the apparent magnitude of an object if it were 32.6 light years away or 10 parsecs from Earth. 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. The star's temperature has been calculated at being about 4200 Kelvin. (Based on the b-v value of 1.16 and the lookup on SDSS.)

109 Herculis Radius has been calculated as being 11.81 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,220,167.36. km.

Source of Information

The source of the information came 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.

109 Herculis Facts


Traditional Name109 Herculis
Hipparcos Library I.D.90139
Henry Draper Designation169414
Celestial TypeStar
Absolute Magnitude0.87
Apparent Magnitude3.85
Right Ascension (R.A.)18h 23m 41.77
Declination (Dec.)+21 d 46 ` 13.2
Distance from the Sun / Earth128.41 Light Years
Spectral TypeK2III
Colour (K) orange to red
Star Type (III) giant.
Variable Star ClassConstant, non-variable
Radius (x the Sun)11.81
Calculated Temperature Range3,700.00 - 5,200.00


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