Stacking fail ?

[Miguel1983]

Hi,

i'm not new to this, but right now i not sure what's going on.

Stacked my IC443 Ha subs (53x240s) and the stacked image doesn't show the DSO, stretching it to the max in DSS doesn't do anything, just some more stars show up.

I thought DSS was the problem so i loaded the stack and a single sub in Pixinsight, same thing, image below show's an autostretch of the stacked image left and single sub right.

Any idea's ?

Thanks

[happy-kat]

Did you register the images first in DSS, look at the scores. Was it cloudier than you thought.

[Miguel1983]

Hi, 

yes i have registered the subs and selected the highest score as my reference.

Before stacking i did blink the subs in Pix and there were indeed signs of cloudhaze.

[happy-kat]

If there are files with much lower scores from your reference file I would not stack them, and try that.

[Miguel1983]

7 minutes ago, happy-kat said:

If there are files with much lower scores from your reference file I would not stack them, and try that.

I got scores from 1400 to 2700

[Miguel1983]

Just stacked 10 images with the highest score, still nothing 🤔

[happy-kat]

Mileage may vary but I'm quite hard at not including files that score lower or have larger FWHM or lower star count.

[Miguel1983]

Ok, i'm getting somewhere now, i stacked various combinations, excluding flat, dark and bias one at a time, seems the bias is doing something here, no clue though.

[wimvb]

Why not do the stacking in pixinsight? Use the script (BatchPreprocessing). 

Edited December 28, 2019 by wimvb