Siril can't register my images?

Siril Team Siril NGC1333 NGC Objects Deep Sky Nebula
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SternwarteOrion2023 avatar
SternwarteOrion2023 avatar
Hi!
I've some troubles with Siril. I photographed the Embryo neblula (NGC 1333) without guiding, so my sub exposures are only 15s long. If I try to register the images, Siril only registers half of the images. I don't understand, why Siril can't align the stars in the images:

Why is this image registered but

this image isn't?

The console only says "Cannot align the stars".
I use the 2 or 3 star alignment method, because every other method worked even worse. I use the bright star in the middle of the image and the bright star in the upper right corner. 

Kind regards,
Sternwarte Orion
Helpful
Quarkus avatar
Quarkus avatar
Go to dynamic PSF. Click Star Detection. By changing the threshold and roundness threshold, all stars should be selected. Then do a global star alignment
Götz Golla avatar
Götz Golla avatar
Hi,

I think you will get the best answer when you post your question directly in the Siril forum. The Siril developers usually react quickly and have excellent answers. 

https://discuss.pixls.us/c/software/siril/34

Goetz
Well written Concise
TJ Bagchi avatar
TJ Bagchi avatar
Hi, from the images that you have posted, looks like very few stars. That may be the reason Suril is not able to align. If you are familiar with Deepskystacker, increase both star detection threshold and FITS brightness threshold and see if you get any better results. If not, you may have to increase exposure.

TJ
Helpful Concise
paddy36 avatar
paddy36 avatar
Hi Sternwarte Orion ,

The signal to noise ratio is too low, so increase the time of acquisition for having more stars and signal as well..!

CS

Paddy36
Tony Gondola avatar
Tony Gondola avatar
I shoot at 15 sec. all the time and have never had this problem but I do see it if I go much shorter, that's with a dual band filter. The best solution is to increase the star detection threshold as quark-coder suggested.
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