Universe Guide

107 Herculis - HD168914 - HIP89935

107 Herculis is a blue main sequence dwarf star that can be located in the constellation of Hercules. HIP89935 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD168914. 107 Herculis has alternative name(s), 107 Herculis , 107 Her.

Location of 107 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 107 Herculis, the location is 18h 21m 01.02 and +28 d 52 ` 11.4 .

Proper Motion of 107 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 048.00 ± 000.00 towards the north and 004.00 ± 000.00 east if we saw them in the horizon.

107 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 9.0000000 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 107 Herculis

107 Herculis has a spectral type of A7V. This means the star is a blue coloured main sequence dwarf star. The star has a B-V Colour Index of 0.21 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,708 Kelvin.

107 Herculis has been calculated as 4.12 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,867,472.84.km.

107 Herculis Apparent and Absolute Magnitudes

107 Herculis has an apparent magnitude of 5.12 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 0.52 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.52. 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 107 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.00 which gave the calculated distance to 107 Herculis as 271.80 light years away from us or 83.33 parsecs. In 2007, Hipparcos data was revised with a new parallax of 12.00 which put 107 Herculis at a distance of 271.80 light years or 83.33 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.

107 Herculis Facts


Traditional Name107 Herculis
Short Name107 Her
Alternative Name(s)107 Herculis
Hipparcos Library I.D.89935
Henry Draper Designation168914
Celestial TypeStar
Absolute Magnitude0.52 / 0.52
Apparent Magnitude5.12
Right Ascension (R.A.)18h 21m 01.02
Declination (Dec.)+28 d 52 ` 11.4
1997 Distance12.00 Parallax (milliarcseconds)
 271.80 Light Years
 83.33 Parsecs
2007 Distance12.00 Parallax (milliarcseconds)
 271.80 Light Years
 83.33 Parsecs
Proper Motion Dec.48.00 ± 0.00 milliarcseconds/year
Proper Motion RA.4.00 ± 0.00 milliarcseconds/year
B-V Index0.21
Spectral TypeA7V
Colour(A) blue
Star Typemain sequence dwarf star
Radius (x the Sun)4.12
Luminosity (x the Sun)9.0000000
Calculated Effective Temperature7,708 Kelvin


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