NGC6888 - The Crescent Nebula (John Dziuba)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192163 · HD192182 · HD192303 · HD192361 · HD192444 · HD192537 · HD228067 · HD228077 · HD228139 · HD228152 · HD228185 · HD228243 · HD228289 · HD228304 · HD228324 · HD228376 · HD228409 · HD228410 · HD228411 · HD228412 · HD228424 · HD228461 · HD228490 · LBN 203 · NGC 6888 · Sh2-105

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NGC6888 - The Crescent Nebula

Powered byPixInsight

NGC6888 - The Crescent Nebula

After a long Summer break due to the South Florida rainy season, this image of the Crescent nebula is the first project that I have been able to complete with my own equipment since May. It is also first light on a new CEM-120EC2 mount. I am having an issue with elongated stars that I think is related to guiding with the new mount. I will be working to correct that going forward. But I am happy with the mount and have found it surprisingly resistant to light wind.

Roughly 5,000 light years away from us, NGC6888 is caused by a massive central star called HD192163. It is visible in the image below and to the left of the dark spot at the center of the nebula. This central star is 21 times more massive than the sun, 600,000 times brighter and 5.1 times larger. It is about 4.7 million years old and nearing the end of its life. In a few hundred thousand years it will explode in a supernova event. Around 120,000 to 240,000 years ago it ejected a significant amount of material when it became a red supergiant. That material is still expanding outward away from the star. Currently, the star is ejecting a fast moving and highly energized stellar wind from its hot surface that is catching up to and colliding with the shell of ejected material. There are two shock waves as a result of that collision, one moving out and one moving in. The ultraviolet rays from the star cause the shell to glow.

Original
B
C
Final
D

Light Polluted skies
ASI 6200 MM Pro
Southern Hemisphere Astro
Florida / Georgia Imagers

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Status	Advanced success
Started	...
Astrometry.net job	6268778
PixInsight job	HDJWD9HYCYJG6UCI9TVZ8DF3XNTZ4XEL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m08s.733
RA (top/left)	20h09m44s.697
RA (top/right)	20h13m40s.861
RA (bottom/right)	20h14m33s.471
RA (bottom/left)	20h10m35s.558

Dec (center)	+38°20′37″.81
Dec (top/left)	+38°12′35″.14
Dec (top/right)	+37°57′30″.83
Dec (bottom/right)	+38°28′35″.20
Dec (bottom/left)	+38°43′47″.85

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NGC6888 - The Crescent Nebula

NGC6888 - The Crescent Nebula

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NGC6888 - The Crescent Nebula

NGC6888 - The Crescent Nebula

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