NGC 6888, Crescent Nebula (Doug Summers)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

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NGC 6888, Crescent Nebula

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NGC 6888, Crescent Nebula

Approximately 5000 light-years away in the constellation Cygnus the swan, NGC 6888 sits in a dense star field containing copious amounts of hydrogen gas. The fairly sized (18' x 12') emission nebula is caused by a double shock wave from the central Wolf-Rayet star WR-136 (one of the brightest known of its class). One of the shock waves is directed inward, exciting Hydrogen to X-ray level energies, and the other shock wave is directed outward, strongly exciting Oxygen by UV radiation. The Wolf-Rayet star is only 15 times more massive than our sun, but extremely bright; more than 250,000 times brighter than our sun. It burns extremely hot (above 55000 Kelvin), causing an intense stellar wind. The end-game for this star is most likely a supernovae, possibly in a few 10s of thousands of years.

In this view, I've cropped the image to allow for a closer look at the nebula's intricate swirling details. Is that a Bok globule near the center of the nebula just below the WR star? It sure looks like one!

The OSC Club (One Shot Camera)
Celestron RASA

Bright/Dark Nebulae

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Astrometry.net job	7818080
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NGC 6888, Crescent Nebula

NGC 6888, Crescent Nebula

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NGC 6888, Crescent Nebula

NGC 6888, Crescent Nebula

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