The Big Question (NGC7822 and friends) (Don Walters)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: NGC 7762 · NGC 7822 · The star 10Cas

The Big Question (NGC7822 and friends), Don Walters

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The Big Question (NGC7822 and friends)

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The Big Question (NGC7822 and friends)

This was a fun target. I've been wanting this one for a while, but it wasn't practical until got my ASI1600 hooked up to a lens for a wider field of view.

I captured a whole bunch of OIII, but after stacking I found there was a significant halo around the whole shot. This was not to be found on my Ha and SII stacks. I recalibrated with my flats again and confirmed that the master flat looked good. The only real difference I see is that the mean is higher by about 1000 DN 16-bit compared to my Ha and SII master flats. My only other option is to reshoot my OIII flats and see if that helps any.

So in the meantime, I opted to produce a bicolor pic with synthetic third channel. The PixelMath combination was:

R = Ha

G = SII * 0.8 + Ha * 0.2

B = SII

Afterwards, I did:

DBE

HT

ACDNR

HT again

HDRMT

I've been trying to keep my post processing to a minimum. I did not get carried away with noise control either, because I'm beginning to feel like it has a more "natural" appearance. I also believe in using more subs to give me the noise control I want, but its hard to reach the necessary number of subs.

I've done it both ways, and it seems like doing DBE to the individual channels beforehand doesn't buy me very much. Seems to be more effective after RGB combination.

I calculate 13.5 stops of dynamic range for this shot. Could have been a full 14 stops I had been able to include my OIII subs.

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Status	Basic success
Started	...
Astrometry.net job	2361904
PixInsight job	n/a
PixInsight queue size	n/a
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The Big Question (NGC7822 and friends)

The Big Question (NGC7822 and friends)

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The Big Question (NGC7822 and friends)

The Big Question (NGC7822 and friends)

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