Universe Guide

102 Herculis - HD166182 - HIP88886

102 Herculis is a blue subgiant star that can be located in the constellation of Hercules. HIP88886 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD166182. 102 Herculis has alternative name(s), 102 Herculis , 102 Her.

Location of 102 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 102 Herculis, the location is 18h 08m 45.49 and +20 d 48 ` 52.5 .

Proper Motion of 102 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 -006.00 ± 000.00 towards the north and -002.00 ± 000.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 102 Herculis

102 Herculis has a spectral type of B2IV. This means the star is a blue coloured subgiant star. The star has a B-V Colour Index of -0.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 14,202 Kelvin.

102 Herculis has been calculated as 10.29 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,156,971.07.km.

102 Herculis Apparent and Absolute Magnitudes

102 Herculis has an apparent magnitude of 4.37 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 -4.12 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.62. 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 102 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.00 which gave the calculated distance to 102 Herculis as 1630.82 light years away from us or 500 parsecs. In 2007, Hipparcos data was revised with a new parallax of 4.00 which put 102 Herculis at a distance of 815.41 light years or 250 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.

102 Herculis Facts


Traditional Name102 Herculis
Short Name102 Her
Alternative Name(s)102 Herculis
Hipparcos Library I.D.88886
Henry Draper Designation166182
Celestial TypeStar
Absolute Magnitude-4.12 / -2.62
Apparent Magnitude4.37
Right Ascension (R.A.)18h 08m 45.49
Declination (Dec.)+20 d 48 ` 52.5
1997 Distance2.00 Parallax (milliarcseconds)
 1630.82 Light Years
 500 Parsecs
2007 Distance4.00 Parallax (milliarcseconds)
 815.41 Light Years
 250 Parsecs
Proper Motion Dec.-6.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-2.00 ± 0.00 milliarcseconds/year
B-V Index-0.16
Spectral TypeB2IV
Colour(B) blue
Star Typesubgiant star
Radius (x the Sun)10.29
Calculated Effective Temperature14,202 Kelvin


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