Crescent Nebula #7 (HOO) (Molly Wakeling)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888 · Sh2-105

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Crescent Nebula #7 (HOO)

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Crescent Nebula #7 (HOO)

Wow! Is this really one of mine??

I decided to take another stab at the Crescent Nebula, this time with my 8" Schimdt-Cassegrain reflector and narrowband filters. I've had some decent results before, but was feeling really good about this attempt!

The Crescent Nebula, cataloged as NGC 6888, is located about 5,000 lightyears away in the nebula-rich constellation of Cygnus. This is no ordinary emission nebula -- a type of star called a Wolf-Rayet star, which generates a fast and energetic stellar wind, is located at the center of the Crescent structure. This particular star, WR 136 (also known as V1770 Cygni, a variable star), is creating a stellar wind that is slamming into its own slower-moving wind ejected back when it was a red giant, some 250,000 years ago, at 3.8 million miles per hour! This created two shockwaves -- one moving inward, and one moving outward -- and all of the cool structure we see in the Crescent. The portions that glow red are energized hydrogen gas, and the blue-green parts are from energized oxygen gas. There are other gases present, but these two glow the brightest. The star is expected to go supernova sometime in the next couple hundred thousand years or so.

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Status	Advanced success
Started	...
Astrometry.net job	5008984
PixInsight job	KEFCN075YT0U3GVA7HN8976QRY1R3FXV
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m05s.360
RA (top/left)	20h14m15s.341
RA (top/right)	20h09m37s.561
RA (bottom/right)	20h09m56s.716
RA (bottom/left)	20h14m31s.879

Dec (center)	+38°21′25″.31
Dec (top/left)	+38°44′07″.75
Dec (top/right)	+38°39′30″.69
Dec (bottom/right)	+37°58′33″.40
Dec (bottom/left)	+38°03′07″.38

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Crescent Nebula #7 (HOO)

Crescent Nebula #7 (HOO)

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Crescent Nebula #7 (HOO)

Crescent Nebula #7 (HOO)

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