Contains: M 27, Dumbbell nebula, NGC 6853
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M27: Dumbbell Nebula (AAPODx2 selection 11/20/2017)

Technical card

Resolution: 3800x2525

Dates: June 11, 2017June 12, 2017June 18, 2017June 22, 2017June 27, 2017June 28, 2017June 30, 2017July 1, 2017July 2, 2017

ZWO Blue: 35x150" (gain: 150.00)
ZWO Green: 21x150" (gain: 150.00)
ZWO H-alpha 7nm: 66x150" (gain: 150.00)
ZWO H-alpha 7nm: 5x400" (gain: 150.00)
ZWO OIII: 16x150" (gain: 150.00)
ZWO OIII: 9x400" (gain: 150.00)
ZWO Red: 37x150" (gain: 150.00)

Integration: 8.8 hours

Avg. Moon age: 12.99 days

Avg. Moon phase: 48.42% job: 1642383

RA center: 299.888 degrees

DEC center: 22.712 degrees

Pixel scale: 0.920 arcsec/pixel

Orientation: -173.624 degrees

Field radius: 0.583 degrees


I'm not sure this is what I was going for, but this is what I got!



Chris Sullivan



RGB with some narrowband mixed in, but it's hard to see. I didn't really get the outer butterfly like I wanted. I guess I'll try to gather some more narrowband, but man am I getting tired of doing this one!


Added about a half hour of Ha and an hour of O3. I can't really tell the difference. I'll probably reprocess from scratch.


Finally got the outer shell visible!


I actually thought I was finished with this, but upon finally closing out of Photoshop, I found an earlier unsaved draft that I thought had better color and star sizes in the core (and only the core), so I combined it with the rest of version L.


I had adjusted the levels in Version M as well, but forgot to 'undo' the adjustment to the outer shell.

Sky plot

Sky plot


M27: Dumbbell Nebula (AAPODx2 selection 11/20/2017), Chris Sullivan