North America and Pelican in HOO (Ken Sablinsky)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 56 Cyg · 57 Cyg · 62 ksi Cyg · B349 · B353 · B355 · B358 · IC 5070 · NGC 6989 · NGC 6996 · NGC 6997 · NGC 7000 · North America Nebula · Pelican Nebula · Sh2-117 · The star 56Cyg · The star 57Cyg · The star ξCyg

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North America and Pelican in HOO

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North America and Pelican in HOO

The North America Nebula and Pelican in HOO.

After waiting months for the backordered OIII filter, it finally arrived and I could try my hand at a narrowband HOO combination. I'd seen some images with much longer exposures than was usual for these CMOS cams (like 10-20 minutes instead of the 2-5 minutes), so I tried the same thing with this image, figuring maybe I didn't need to worry about preserving RGB star colors. Overall it worked nicely, as the nebulae really popped out well. Though perhaps the same total integration of shorter exposures would also work well.

I did have some trouble with the OIII channel and fatter stars, because I pushed the OIII data much further than the Ha, leading to bloated stars. So there is a blue halo around many of the stars in the image. I think if I'm more careful with masks, I can minimize this in a future revision, or perhaps work on a starless OIII frame and add the stars back in later.

8x 1200s Ha
8x 1200s OIII

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Status	Advanced success
Started	...
Astrometry.net job	4945493
PixInsight job	AW58A3AMRPM5G62Q3WSDDDXTR6WQC1Y6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h56m47s.93
RA (top/left)	21h08m32s.66
RA (top/right)	20h46m45s.99
RA (bottom/right)	20h45m27s.74
RA (bottom/left)	21h06m19s.73

Dec (center)	+44°24′28″.2
Dec (top/left)	+45°24′22″.8
Dec (top/right)	+45°53′18″.4
Dec (bottom/right)	+43°20′14″.4
Dec (bottom/left)	+42°52′29″.2

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North America and Pelican in HOO

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