NGC6888 Crescent Nebula (Mike Cranfield)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · LBN 193 · LBN 203 · NGC 6888 · Sh2-105

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NGC6888 Crescent Nebula

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NGC6888 Crescent Nebula

The Crescent Nebula is situated about 5,000 light-years away in the constellation of Cygnus. It extends to about 18' along its major axis which makes it about 25 light-years across.

At its heart is the Wolf-Rayet star WR136 which ejected the web of luminous material that we now see as the crescent nebula some 250,000 years ago when it became a red super-giant. This shell is expanding at around 80km/s.

WR136 is extremely hot with a strong stellar wind ejecting a mass equivalent to Jupiter every 10 years. This stellar wind is rushing some 20 to 25 times faster than the rate at which the shell is expanding. As such it is catching it up and interacting and this creates the patterns we see in the shell.

The star is now around 4.7m years old and approaching the end of its life. Within the next few hundred thousand years the star will explode as a supernova.

This image is composed of just H alpha and Oiii data. For this image I have, for the first time, used the excellent NoiseXTerminator and StarXTerminantor processes offered by RC-astro. Both these processes work extremely well and greatly simplify their respective functions with great results. Stretching was undertaken using the GHS script which was also used for additional contrast enhancement and saturation.

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Status	Advanced success
Started	...
Astrometry.net job	5829937
PixInsight job	3YTISA69GE6WDK7F65EKGGBDDCEE3XT0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m09s.575
RA (top/left)	20h14m23s.927
RA (top/right)	20h14m49s.506
RA (bottom/right)	20h09m52s.930
RA (bottom/left)	20h09m33s.214

Dec (center)	+38°22′15″.10
Dec (top/left)	+37°37′10″.44
Dec (top/right)	+39°04′01″.10
Dec (bottom/right)	+39°07′00″.87
Dec (bottom/left)	+37°40′05″.20

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NGC6888 Crescent Nebula

NGC6888 Crescent Nebula

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