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WR 109 (Wolf-Rayet Star) Facts

WR 109 Facts

WR 109's Alternative Names

More details on objects' alternative names can be found at Star Names .

Location of WR 109

The location of the wolf-rayet star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For WR 109, the location is 18 07 50.8974693468 and -35 10 25.119230585 .

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 109

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 -7.40 miliarcseconds/year towards the north and 1.37 miliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of WR 109

WR 109 has a spectral type of WN3C .

Distance to WR 109

The Parallax of the star is given as 0.04 which gives a calculated distance to WR 109 of 75152.84 light years from the Earth or 23041.47 parsecs. It would take a spaceship travelling at the speed of light, 75152.84 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 4,752,611,228.54 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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Additional WR 109 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameWR 109
Alternative NamesWR 109
Spectral TypeWN3C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeWolf-Rayet star
GalaxyMilky Way
ConstellationSagittarius
Right Ascension (R.A.)18 07 50.8974693468
Declination (Dec.)-35 10 25.119230585
Distance from Earth0.04 Parallax (milliarcseconds)
 75152.84 Light Years
 23041.47 Parsecs
 4,752,611,228.54 Astronomical Units
Proper Motion Dec.-7.40 milliarcseconds/year
Proper Motion RA.1.37 milliarcseconds/year

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=v617%20sagittarii

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