NGC 6543 Cat's Eye Nebula (star-watcher.ch)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: IC 4677 · NGC 6543 · NGC 6552 · PK096+29.1

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NGC 6543 Cat's Eye Nebula

Link: https://www.star-watcher.ch/blog/

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NGC 6543 Cat's Eye Nebula

Link: https://www.star-watcher.ch/blog/

This time especially the right upper corner is problematic (left upper corner too, but not that much as the right upper corner). At least not all 4 corners are affected in the same way...
I'm unsure what's the reason for this... So far, after reading a lot about the topic, I think the problem is:
- working distance to the corrector not accurate
- small remaining tilt

On the single sub only the right bottom corner seems to be OK.

Please advise if I'm wrong.

I'm already thinking about a 2" screw adapter for the MPCC to prevent tilting...

And by the way, this is a very faint planetary nebula...

Final
Original
B

B

Description: Single sub, 120s exposure time

Uploaded: ...

Sky-Watcher Explorer 130PDS
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iOptron CEM26/GEM28

Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	5719378
PixInsight job	KCKEFH9TFFZHZEK0G6TW62TE3I4OIQUY
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	17h59m12s.56
RA (top/left)	18h09m11s.21
RA (top/right)	17h48m57s.86
RA (bottom/right)	17h49m45s.30
RA (bottom/left)	18h08m56s.39

Dec (center)	+66°38′18″.4
Dec (top/left)	+67°17′24″.7
Dec (top/right)	+67°14′53″.10
Dec (bottom/right)	+65°56′54″.3
Dec (bottom/left)	+65°59′16″.6

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NGC 6543 Cat's Eye Nebula

NGC 6543 Cat's Eye Nebula

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NGC 6543 Cat's Eye Nebula

NGC 6543 Cat's Eye Nebula

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