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164 G. Oph, HD160781, HIP86575

164 G. Oph is a white to yellow star that can be located in the constellation of Ophiuchus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP86575 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD160781. The Id of the star in the Gould Star Catalogue is 164. 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 164 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 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 164 G. Oph, the location is 17h 41m 32.32 and +06d 18` 47.4 .

Proper Motion of 164 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 -2.64 ± 0.21 miliarcseconds/year towards the north and -2.61 ± 0.39 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -30.50000 km/s with an error of about 0.30 km/s .

Physical Properties (Colour, Temperature, Radius) of 164 G. Oph

164 G. Oph has a spectral type of G7III. This means the star is a white to yellow star. The star is 7126.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23242.3998934400000000s. The star has a B-V Colour Index of 1.27 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,372 Kelvin.

164 G. Oph Radius has been calculated as being 39.59 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 27,545,234.34.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 36.10. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

164 G. Oph Apparent and Absolute Magnitudes

164 G. Oph has an apparent magnitude of 5.97 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 -1.93 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.73. 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 164 G. Oph

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.63 which gave the calculated distance to 164 G. Oph as 1240.16 light years away from Earth or 380.23 parsecs. It would take a spaceship travelling at the speed of light, 1240.16 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 2.89 which put 164 G. Oph at a distance of 1128.59 light years or 346.02 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,126.00 Parsecs or 23,242.40 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

164 G. Oph Facts

Alternative Names

Traditional/Proper Name164 G. Oph
Hipparcos Library I.D.86575
Bonner DurchmusterungBD+06 3498
Gould I.D.164
Henry Draper Designation160781

Visual Facts

Star Type star
Absolute Magnitude-1.93 / -1.73
Visual / Apparent Magnitude5.97
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 41m 32.32
Declination (Dec.)+06d 18` 47.4
Galactic Latitude18.41 degrees
Galactic Longitude30.62 degrees
1997 Distance from Earth2.63 Parallax (milliarcseconds)
 1240.16 Light Years
 380.23 Parsecs
2007 Revised Distance from Earth2.89 Parallax (milliarcseconds)
 1128.59 Light Years
 346.02 Parsecs
Galacto-Centric Distance23,242.40 Light Years / 7,126.00 Parsecs
Proper Motion Dec.-2.64 ± 0.21 milliarcseconds/year
Proper Motion RA.-2.61 ± 0.39 milliarcseconds/year
B-V Index1.27
Radial Velocity-30.50 ± 0.30 km/s
Spectral TypeG7III
Colour(G) White to Yellow

Estimated Facts

Calculated Effective Temperature4,372 Kelvin

Sources and Links

SIMBAD SourceLink

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