Universe Guide

146 G. Oph - HD158352 - HIP85537

146 G. Oph is a blue main sequence dwarf star that can be located in the constellation of Ophiuchus. HIP85537 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD158352. The Id of the star in the Gould Star Catalogue is 146. 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 146 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 146 G. Oph, the location is 17h 28m 49.69 and +00 d 19`50.1 .

Proper Motion of 146 G. Oph

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 020.00 ± 000.00 towards the north and -065.00 ± 000.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 146 G. Oph

146 G. Oph has a spectral type of A8V. This means the star is a blue coloured main sequence dwarf star. The star has a B-V Colour Index of 0.23 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,593 Kelvin.

146 G. Oph has been calculated as 2.79 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,943,331.95.km.

146 G. Oph Apparent and Absolute Magnitudes

146 G. Oph has an apparent magnitude of 5.41 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 1.43 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.56. 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 146 G. Oph

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.00 which gave the calculated distance to 146 G. Oph as 203.85 light years away from us or 62.5 parsecs. In 2007, Hipparcos data was revised with a new parallax of 17.00 which put 146 G. Oph at a distance of 191.86 light years or 58.82 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.

146 G. Oph Facts


Traditional Name146 G. Oph
Hipparcos Library I.D.85537
Gould I.D.146
Henry Draper Designation158352
Celestial TypeStar
Absolute Magnitude1.43 / 1.56
Apparent Magnitude5.41
Right Ascension (R.A.)17h 28m 49.69
Declination (Dec.)+00 d 19`50.1
1997 Distance16.00 Parallax (milliarcseconds)
 203.85 Light Years
 62.5 Parsecs
2007 Distance17.00 Parallax (milliarcseconds)
 191.86 Light Years
 58.82 Parsecs
Proper Motion Dec.20.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-65.00 ± 0.00 milliarcseconds/year
B-V Index0.23
Spectral TypeA8V
Colour(A) blue
Star Typemain sequence dwarf star
Radius (x the Sun)2.79
Calculated Effective Temperature7,593 Kelvin


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