Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105) (Greg Erianne)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192041 · HD192102 · HD192123 · HD192163 · HD192182 · HD192303 · HD192361 · HD192422 · HD192443 · HD192444 · HD228139 · HD228152 · HD228153 · HD228185 · HD228186 · HD228198 · HD228205 · HD228243 · HD228261 · HD228262 · HD228277 · HD228289 · HD228290 · HD228304 · HD228311 · HD228324 · HD228376 · And 3 more.

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Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105)

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Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105)

The Crescent Nebula (NGC 6888) is an emission nebula in the constellation Cygnus. It's about 5000 light-years away from Earth. The blue areas show the location of oxygen (O-III) gas, while the other areas of the Nebula and the surrounding clouds show the location of hydrogen (H-II/H-alpha) gas.This was my first image with the Celestron EdgeHD 8 after spending a week and a half or so ironing out all the wrinkles, learning the scope, and getting it set up for imaging. I've imaged Crescent Nebula before, but nowhere near this long a focal length. The last time I imaged this Nebula was at 360mm fL with my AT60ED refractor, and I was very curious how much more detail could be shown. Celestron EdgeHD 8 with 0.7x Reducer (fL = 1422mm)
ASI2600MC Pro (OSC camera)
ZWO AM5 mount with guiding via OAG and ASI174MM Mini
Light Frames [Total Exposure 4:35] used Antlia ALP-T Dual (Ha, OIII) Narrowband filter -- 300s x 55 frames
All light frames calibrated with dark, flat, and bias frames
Pre- and post-processed in PixInsight
Additional post-processing in Photoshop for exposure adjustments and generation of jpeg

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Status	Advanced success
Started	...
Astrometry.net job	8411924
PixInsight job	V9EFTWBPMU8H5NPBURM2CK8BWYP12EOE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m06s.440
RA (top/left)	20h10m53s.175
RA (top/right)	20h10m37s.179
RA (bottom/right)	20h13m18s.748
RA (bottom/left)	20h13m36s.784

Dec (center)	+38°22′41″.45
Dec (top/left)	+38°49′33″.69
Dec (top/right)	+37°57′46″.31
Dec (bottom/right)	+37°55′44″.78
Dec (bottom/left)	+38°47′32″.69

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Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105)

Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105)

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Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105)

Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105)

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