NGC 7023 IRIS

 Posted: Aug 31st, 2026
Show astrometry on hover
NGC
IC
HD
Technical Info
Telescope/Lens: celestron 80ED f 7.5/600mm
Camera: ZWO ASI 533MC Pro
Mount: Sky-Watcher Star Adventurer GTi
Guide Scope: svbony sv165
Guide Camera: zwo asi662mc
Software: Siril, pixinsight,PS
Accessories: reducer sv193 ×0.8 asiair mini
Exposure:
160 x 120" ISO/Gain: 100 - Optolong uv ir cut
Green, Bortle 4 zone:
 Kichmengskiy Gorodok Vologodskaya Oblast, Россия
 Aug 30th, 2026
5 h 20 m
126
Resolution: 2875x2755 px
Scale: 1400 KB
Can anyone who knows about this tell me, is this coma on the stars or what is it?
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Comments

Unlike anyone else!
31 Aug, 2026 Reply
Nickolay Replied to Mikelazer
Defocus?
31 Aug, 2026 Reply
Poppy8micro Replied to Nickolay
It looks like a tilt of the matrix relative to the optics.
31 Aug, 2026 Reply
Nickolay Replied to Poppy8micro
Well, I like this better. I don't know if the ICQ interface shows this or not, but there, when you hover over an object in the atlas, you position a red square, and when the camera aligns, it matches with a blue square. For me, one corner of the squares' frames matches, but the other three are out of sync, just like in geometry when two planes don't lie flush against each other. I'll attach a link now, I took a screenshot.
31 Aug, 2026 Reply
Poppy8micro Replied to Nickolay
This frame doesn't say anything. It's just the program displaying line overlays. Use Siril or pixel analysis of the images and check the tilt of the sensor.
31 Aug, 2026 Reply
Nickolay Replied to Poppy8micro
Understood, thank you.
31 Aug, 2026 Reply
It doesn't look like tilt — ASIFitsViewer shows there is no tilt.

The question is about the shifted circles around the stars?
1 Sep, 2026 Reply
Nickolay Replied to Ankorot
I'm talking about them.
1 Sep, 2026 Reply
Nickolay Replied to Ankorot
Here is the link to the raw FITS files and a random selection of individual frames — they are better visible there.
1 Sep, 2026 Reply

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