Crescent Nebula (NGC 6888) (Alf Jacob Nilsen)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192163 · HD192182 · HD228243 · HD228304 · HD228376 · LBN 203 · NGC 6888 · Sh2-105

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Crescent Nebula (NGC 6888)

Link: https://www.biophoto.net/portfolio/C00004xuSTyozN44/G0000w7tieJ_NCUM/I00003.6YG2aHlJs

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Crescent Nebula (NGC 6888)

Link: https://www.biophoto.net/portfolio/C00004xuSTyozN44/G0000w7tieJ_NCUM/I00003.6YG2aHlJs

First image of the season afetr a rather warm and dry summer here along the coast of south-western Norway. I used my 12,5'' iDK for this beautiful nebula in constellatioin Cygnus, situated about 5 000 l.y. from Earth. Nearly 4 hrs of RGB obtaines with ASI2600c was combines in PixInsight with 5h 40min Ha and OII obtaines with ASI1600m. I struggled a lot to get a good combinition, but ebnded up making the Ha/OIII combinition using SHO-AIP script in PI. Using pixel math and star mask I added the RGB-portion keeping the RGB-stars intact.

Comments are most welcome...
AJ

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Status	Advanced success
Started	...
PixInsight job	ZKXMQJSFCAZHIXCEKNO72ZPR0CW1SOZ2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m01s.931
RA (top/left)	20h11m57s.996
RA (top/right)	20h13m26s.223
RA (bottom/right)	20h12m05s.863
RA (bottom/left)	20h10m37s.345

Dec (center)	+38°21′50″.45
Dec (top/left)	+38°05′04″.77
Dec (top/right)	+38°24′44″.19
Dec (bottom/right)	+38°38′35″.80
Dec (bottom/left)	+38°18′50″.49

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