Universe Guide

104 Herculis - HD167006 - HIP89172

104 Herculis is a red eruptive giant star that can be located in the constellation of Hercules. HIP89172 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD167006. 104 Herculis has alternative name(s), 104 Herculis , V669_Her, 104 Her.

Location of 104 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 104 Herculis, the location is 18h 11m 54.17 and +31 d 24 ` 19.0 .

Proper Motion of 104 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 025.00 ± 000.00 towards the north and -015.00 ± 000.00 east if we saw them in the horizon.

104 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 10.0000000 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 104 Herculis

104 Herculis has a spectral type of M3III. This means the star is a red coloured giant star. The star has a B-V Colour Index of 1.64 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,671 Kelvin.

104 Herculis has been calculated as 47.14 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 32,797,011.97.km.

104 Herculis Apparent and Absolute Magnitudes

104 Herculis has an apparent magnitude of 4.96 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 -1.55 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.15. 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 104 Herculis

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 104 Herculis as 652.33 light years away from Earth or 200 parsecs. In 2007, Hipparcos data was revised with a new parallax of 6.00 which put 104 Herculis at a distance of 543.61 light years or 166.67 parsecs.

It would take a spaceship travelling at the speed of light, 652.33 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 104 Herculis

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. 104 Herculis brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 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.

104 Herculis Facts


Traditional Name104 Herculis
Short NameV669 Her, 104 Her
Alternative Name(s)104 Herculis
Hipparcos Library I.D.89172
Bonner DurchmusterungBD+31 3199
Henry Draper Designation167006
Celestial TypeStar
Absolute Magnitude-1.55 / -1.15
Apparent Magnitude4.96
Right Ascension (R.A.)18h 11m 54.17
Declination (Dec.)+31 d 24 ` 19.0
1997 Distance from Earth5.00 Parallax (milliarcseconds)
 652.33 Light Years
 200 Parsecs
2007 Distance from Earth6.00 Parallax (milliarcseconds)
 543.61 Light Years
 166.67 Parsecs
Proper Motion Dec.25.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-15.00 ± 0.00 milliarcseconds/year
B-V Index1.64
Spectral TypeM3III
Colour(M) Red
Star Typegiant star
Variable Star ClassEruptive
Variable Star TypeIrregular
Radius (x the Sun)47.14
Luminosity (x the Sun)10.0000000
Calculated Effective Temperature3,671 Kelvin


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