Universe Guide

105 Herculis - HD168532 - HIP89773

105 Herculis is an orange to red luminous giant star that can be located in the constellation of Hercules. HIP89773 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD168532. 105 Herculis has alternative name(s), 105 Herculis , 105 Her.

Location of 105 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 105 Herculis, the location is 18h 19m 10.67 and +24 d 26 ` 45.8 .

Proper Motion of 105 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 005.00 ± 000.00 towards the north and 009.00 ± 000.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 105 Herculis

105 Herculis has a spectral type of K4II SB. This means the star is an orange to red coloured luminous giant star. The star has a B-V Colour Index of 1.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,014 Kelvin.

105 Herculis has been calculated as 55.95 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 38,927,433.59.km.

105 Herculis Apparent and Absolute Magnitudes

105 Herculis has an apparent magnitude of 5.30 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 -2.31 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.31. 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 105 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.00 which gave the calculated distance to 105 Herculis as 1087.21 light years away from us or 333.33 parsecs. In 2007, Hipparcos data was revised with a new parallax of 3.00 which put 105 Herculis at a distance of 1087.21 light years or 333.33 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.

105 Herculis Facts


Traditional Name105 Herculis
Short Name105 Her
Alternative Name(s)105 Herculis
Hipparcos Library I.D.89773
Henry Draper Designation168532
Celestial TypeStar
Absolute Magnitude-2.31 / -2.31
Apparent Magnitude5.30
Right Ascension (R.A.)18h 19m 10.67
Declination (Dec.)+24 d 26 ` 45.8
1997 Distance3.00 Parallax (milliarcseconds)
 1087.21 Light Years
 333.33 Parsecs
2007 Distance3.00 Parallax (milliarcseconds)
 1087.21 Light Years
 333.33 Parsecs
Proper Motion Dec.5.00 ± 0.00 milliarcseconds/year
Proper Motion RA.9.00 ± 0.00 milliarcseconds/year
B-V Index1.50
Spectral TypeK4II SB
Colour(K) Orange to Red
Star Typeluminous giant star
Radius (x the Sun)55.95
Calculated Effective Temperature4,014 Kelvin


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