Universe Guide

102 G. Hya - HD78702 - HIP44923

102 G. Hya is a blue main sequence dwarf star that can be located in the constellation of Hydra. HIP is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD. The Id of the star in the Gould Star Catalogue is . 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 102 G. Hya

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 G. Hya, the location is 09h 09m 04.25 and -18 d 19`43.0 .

Physical Properties/View of 102 G. Hya

102 G. Hya has a spectral type of A0/A1V. This means the star is (A) blue coloured (V) main sequence (dwarf star). 102 G. Hya lies at a distance of 260.51 light years away from our Sun and our planet Earth or to put it another way, 79.71 parsecs away from the Sun.

102 G. Hya has an apparent magnitude of 5.73 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 102 G. Hya has an absolute magnitude of 1.22 which is the apparent magnitude of an object if it were 32.6 light years away or 10 parsecs from Earth. 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. The star's temperature has been calculated at being about 9500 Kelvin. (Based on the b-v value of 0 and the lookup on SDSS.)

102 G. Hya Radius has been calculated as being 1.97 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,367,504.49. km.

Source of Information

The source of the information came 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.

102 G. Hya Facts


Traditional Name102 G. Hya
Hipparcos Library I.D.44923
Gould I.D.102
Henry Draper Designation78702
Celestial TypeStar
Absolute Magnitude1.22
Apparent Magnitude5.73
Right Ascension (R.A.)09h 09m 04.25
Declination (Dec.)-18 d 19`43.0
Distance from the Sun / Earth260.51 Light Years
Spectral TypeA0/A1V
Colour (A) blue
Star Type (IV) subgiant.
Variable Star ClassConstant, non-variable
Radius (x the Sun)1.97
Calculated Temperature Range7,500.00 - 10,000.00


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