Universe Guide

117 G. Eri - HD23010 - HIP17214

117 G. Eri is a blue to white giant star that can be located in the constellation of Eridanus. HIP17214 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD23010. The Id of the star in the Gould Star Catalogue is 117. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Location of 117 G. Eri

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 117 G. Eri, the location is 03h 41m 13.75 and -11 d 48`09.0 .

Proper Motion of 117 G. Eri

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 028.00 ± 000.00 towards the north and 080.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 117 G. Eri

117 G. Eri has a spectral type of F2III. This means the star is a blue to white coloured giant star. The star has a B-V Colour Index of 0.37 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,870 Kelvin.

117 G. Eri has been calculated as 3.01 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,096,320.43.km.

117 G. Eri Apparent and Absolute Magnitudes

117 G. Eri has an apparent magnitude of 6.49 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 1.70 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.70. 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 117 G. Eri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.00 which gave the calculated distance to 117 G. Eri as 296.51 light years away from Earth or 90.91 parsecs. In 2007, Hipparcos data was revised with a new parallax of 11.00 which put 117 G. Eri at a distance of 296.51 light years or 90.91 parsecs.

It would take a spaceship travelling at the speed of light, 296.51 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.

117 G. Eri Facts


Traditional Name117 G. Eri
Hipparcos Library I.D.17214
Bonner DurchmusterungBD-12 689
Gould I.D.117
Henry Draper Designation23010
Celestial TypeStar
Absolute Magnitude1.70 / 1.70
Apparent Magnitude6.49
Right Ascension (R.A.)03h 41m 13.75
Declination (Dec.)-11 d 48`09.0
1997 Distance from Earth11.00 Parallax (milliarcseconds)
 296.51 Light Years
 90.91 Parsecs
2007 Distance from Earth11.00 Parallax (milliarcseconds)
 296.51 Light Years
 90.91 Parsecs
Proper Motion Dec.28.00 ± 0.00 milliarcseconds/year
Proper Motion RA.80.00 ± 1.00 milliarcseconds/year
B-V Index0.37
Spectral TypeF2III
Colour(F) blue to white
Star Typegiant star
Radius (x the Sun)3.01
Calculated Effective Temperature6,870 Kelvin


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