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WR 136, HD192163, HIP99546

WR 136 is a star that can be located in the constellation of Cygnus. The star can not be seen by the naked eye, you need a telescope to see it.

HIP99546 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD192163.

Location of WR 136

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 WR 136, the location is 20h 12m 06.55 and +38d 21` 17.8 .

Wolf-Rayet Star

The star is a Wolf-Rayet, a rare type of star of which not many are known. These stars are extremely luminous and large compared to our Sun. They live fast and die hard in a matter of millions not billions of years like our Sun. They exhaust their hydrogen supplies, turning to other gasses and expand outwards with massive solar winds, moving a step closer in the stellar evolution towards their death in a super or hypernova explosion.

Proper Motion of WR 136

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 -6.77 ± 0.36 miliarcseconds/year towards the north and -7.08 ± 0.46 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 -100.00000 km/s with an error of about 999.00 km/s .

Physical Properties (Temperature, Radius) of WR 136

WR 136 has a spectral type of WN.... This means the star is a star. The star has a B-V Colour Index of 0 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,293 Kelvin.

WR 136 Radius has been calculated as being 15.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 10,576,425.95.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 6.73. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

WR 136 Apparent and Absolute Magnitudes

WR 136 has an apparent magnitude of 7.50 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 -3.57 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.80. 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 WR 136

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.61 which gave the calculated distance to WR 136 as 5346.94 light years away from Earth or 1639.34 parsecs. It would take a spaceship travelling at the speed of light, 5346.94 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 1.38 which put WR 136 at a distance of 2363.50 light years or 724.64 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.

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.

WR 136 Facts

Alternative Names

Traditional/Proper NameWR 136
Hipparcos Library I.D.99546
Bonner DurchmusterungBD+37 3821
Henry Draper Designation192163
Wolf-Rayet Id136

Visual Facts

Star Type star
Absolute Magnitude-3.57 / -1.80
Visual / Apparent Magnitude7.50
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 12m 06.55
Declination (Dec.)+38d 21` 17.8
Galactic Latitude2.43 degrees
Galactic Longitude75.48 degrees
1997 Distance from Earth0.61 Parallax (milliarcseconds)
 5346.94 Light Years
 1639.34 Parsecs
2007 Revised Distance from Earth1.38 Parallax (milliarcseconds)
 2363.50 Light Years
 724.64 Parsecs
Proper Motion Dec.-6.77 ± 0.36 milliarcseconds/year
Proper Motion RA.-7.08 ± 0.46 milliarcseconds/year
B-V Index0.00
Radial Velocity-100.00 ± 999.00 km/s
Spectral TypeWN...

Estimated Facts

Calculated Effective Temperature10,293 Kelvin

Sources and Links

SIMBAD SourceLink

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