Universe Guide

122 G. Oph - HD156826 - HIP84801

122 G. Oph is a white to yellow main sequence dwarf star that can be located in the constellation of Ophiuchus. 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 122 G. Oph

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 122 G. Oph, the location is 17h 19m 59.53 and -05 d 55`01.3 .

Physical Properties/View of 122 G. Oph

122 G. Oph has a spectral type of G9V. This means the star is (G) white to yellow coloured (V) main sequence (dwarf star). 122 G. Oph lies at a distance of 174.05 light years away from our Sun and our planet Earth or to put it another way, 53.35 parsecs away from the Sun.

122 G. Oph has an apparent magnitude of 6.31 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 122 G. Oph has an absolute magnitude of 2.67 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 5100 Kelvin. (Based on the b-v value of 0.85 and the lookup on SDSS.)

122 G. Oph Radius has been calculated as being 3.50 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,433,443.67. 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.

122 G. Oph Facts


Traditional Name122 G. Oph
Hipparcos Library I.D.84801
Gould I.D.122
Henry Draper Designation156826
Celestial TypeStar
Absolute Magnitude2.67
Apparent Magnitude6.31
Right Ascension (R.A.)17h 19m 59.53
Declination (Dec.)-05 d 55`01.3
Distance from the Sun / Earth174.05 Light Years
Spectral TypeG9V
Colour (G) white to yellow
Star Type (IV) subgiant.
Variable Star ClassConstant, non-variable
Radius (x the Sun)3.50
Calculated Temperature Range5,200.00 - 6,000.00


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