M27 - Cosmic Shock Waves in Ha and OIII (John Hayes)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: Dumbbell nebula · M 27 · NGC 6853 · PK060-03.1

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M27 - Cosmic Shock Waves in Ha and OIII

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M27 - Cosmic Shock Waves in Ha and OIII

M27, the Dumbbell Nebula is so big and bright that it's a favorite object for anyone starting off in astrophotography, but that doesn't mean that it's necessarily an easy target. It has a super bright core and a lot of interesting faint wisps from the cosmic shock waves radiating outside the main core. Between bad weather and travel, I started this project back in June with one available night for taking data. M27 is very bright and I figured that I'd only shoot two NB colors so it seemed possible. Unfortunately, the wind made the conditions challenging and I didn't get enough good data so I had to go back for a second night. I found that its brightness make it a VERY difficult object to process in narrow band. My first processing attempt back in June was a disaster so I put it aside. Over the last few months I've made a number of attempts to get something acceptable and each time, I gave up in defeat. Finally, I had to ditch my preconceived notions of how to process a bi-color image and began to experiment with different ideas--most of which didn't work. With constant cloudy weather, I finally had a chance to fool with it again and this time, I started to wrestle it under control. I've got eight directories on my disk with different attempts but I think that I must have produced at least a dozen different versions along the way. M27 is pretty easy with a DSLR in RGB but it's on my list of top-10 hard to process narrow band objects. As always, C&C is welcome.

- John

October 25, 2016

Original
B
C
D
Final
E

Cloudy Nights

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Status	Advanced success
Started	...
Astrometry.net job	1297299
PixInsight job	KPRYSMGZDXNL8RII3LP9UNZKGCS53O5W
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h59m35s.482
RA (top/left)	19h58m49s.460
RA (top/right)	20h00m18s.985
RA (bottom/right)	20h00m22s.280
RA (bottom/left)	19h58m51s.931

Dec (center)	+22°43′37″.92
Dec (top/left)	+22°33′34″.67
Dec (top/right)	+22°32′53″.68
Dec (bottom/right)	+22°53′39″.28
Dec (bottom/left)	+22°54′19″.30

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M27 - Cosmic Shock Waves in Ha and OIII

M27 - Cosmic Shock Waves in Ha and OIII

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M27 - Cosmic Shock Waves in Ha and OIII

M27 - Cosmic Shock Waves in Ha and OIII

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