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Offset star colors/pixels after stacking - What did I do wrong?

Astrophotography Beginner DSO Imaging
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#1 AriaA7

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Posted 04 December 2022 - 04:12 PM

Last night was my first time imaging mono in general, with my cooled camera (qhy 268m) as well as stacking SHO together (used Siril, I think both exhibited the same?). I'm very new to AP in general, and am trying to figure out what I have done wrong. When I look at the stars in this pic, I see that there's a consistent offset between the blue and orange in the stars. Attached a pic here with a bit different color processing, showing white/red. It's weird, I figured that if there was an alignment problem, the whole star would be oblong/stretched, but it almost just looks like the color is shifted a couple pixels to the right.

 

Full size and zoomed in- https://imgur.com/a/Auvtue0 

 

The fits files in case it helps -  https://1drv.ms/u/s!...BZNFQ?e=RwFQcl 

 

20 bias

No darks

5 or 6 lights each of 4 minute subs for S,H,O

10 flats per filter

Equipment used is in my signature.

Bortle 7

Guiding was around .2" in phd2

 

Also, I'm definitely open to any tips on things people notice going on with this image in general. Going to head out tonight for a second attempt at capturing.  Thanks!

Attached Thumbnails

  • offest.jpg

Edited by AriaA7, 04 December 2022 - 04:13 PM.


#2 mayhem13

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Posted 04 December 2022 - 05:27 PM

Hard to tell from this image…..post your 5 lights to see if the oblong stars are capture or process fails.



#3 sharkmelley

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Posted 04 December 2022 - 06:36 PM

The fits files in case it helps -  https://1drv.ms/u/s!...BZNFQ?e=RwFQcl 

 

Your SII data is offset compared to your Ha and OIII data.  You need to use the same reference frame for alignment and stacking of each channel.


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