Universe Guide

109 Herculis - HD169414 - HIP90139

109 Herculis is an orange to red giant star that can be located in the constellation of Hercules. HIP90139 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD169414. 109 Herculis has alternative name(s), 109 Herculis , 109 Her.

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 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 109 Herculis, the location is 18h 23m 41.77 and +21d46`13.2 .

Proper Motion of 109 Herculis

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 -242.98 ± 000.25 towards the north and 195.79 ± 000.40 east if we saw them in the horizon.

109 Herculis 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 70.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 109 Herculis

109 Herculis has a spectral type of K2III. This means the star is an orange to red coloured giant star. The star has a B-V Colour Index of 1.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,558 Kelvin.

109 Herculis has been calculated as 10.48 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,289,701.78.km.

109 Herculis Apparent and Absolute Magnitudes

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. If you used the 1997 Parallax value, you would get an absolute magnitude of 0.87 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.04. 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 109 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 25.40 which gave the calculated distance to 109 Herculis as 128.41 light years away from Earth or 39.37 parsecs. In 2007, Hipparcos data was revised with a new parallax of 27.42 which put 109 Herculis at a distance of 118.95 light years or 36.47 parsecs.

It would take a spaceship travelling at the speed of light, 128.41 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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.

109 Herculis Facts


Traditional Name109 Herculis
Short Name109 Her
Alternative Name(s)109 Herculis
Hipparcos Library I.D.90139
Bonner DurchmusterungBD+21 3411
Henry Draper Designation169414
Celestial TypeStar
Absolute Magnitude0.87 / 1.04
Apparent Magnitude3.85
Right Ascension (R.A.)18h 23m 41.77
Declination (Dec.)+21d46`13.2
1997 Distance from Earth25.40 Parallax (milliarcseconds)
 128.41 Light Years
 39.37 Parsecs
2007 Distance from Earth27.42 Parallax (milliarcseconds)
 118.95 Light Years
 36.47 Parsecs
Proper Motion Dec.-242.98 ± 0.25 milliarcseconds/year
Proper Motion RA.195.79 ± 0.40 milliarcseconds/year
B-V Index1.16
Spectral TypeK2III
Colour(K) Orange to Red
Star Typegiant star
Radius (x the Sun)10.48
Luminosity (x the Sun)70.0000000
Calculated Effective Temperature4,558 Kelvin


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