'No Stars Found'

[vmacatee]

Freshman PI user here... 

I have a short stack of 10 frames of M104 (300s each) that I am struggling to integrate.  I have run the pre-prossesing script many times before and never had any issue - until now.  I have tried it both with the script and the star alignment tool with the same result.
This is what I get;

StarAlignment: Processing view: M104_2014050322h53m48s8742501600_24c000093_c
M104_2014050322h53m48s8742501600_24c000093_c:
Structure map: done
Detecting stars: done
0 stars found.
*** Error: No stars found
<* failed *>

What am I doing wrong?

Van

[TobiasLindemann]

Hi Van,

it´s difficult to say. Can you please upload 2-3 raw images of your sequence anywhere, so we can have a look at them.
If you do not have the ability, maybe one jpg and details to your equipment would help too.

Greetings
Tobias

[Andres.Pozo]

You can check if you have any preview defined on the image and the option "Star matching\Restrict to previews" is active. In this case StarAlignment will only search for stars inside the preview. If this is the case, you can delete all the previews or uncheck the option "Restrict to previews".

[vmacatee]

Here is a link to the first three frames of the run.  It is at Atrobin.

http://www.astrobin.com/rawdata/privatesharedfolders/12/

[vmacatee]

Star matching\Restrict to previews WAS checked in the Star Alignement tool.   When I unchecked it and re-ran it in Star Alignment, it worked.  However, when I went back to the Batch Pre-process script and re-ran it.  I got the same results - 'no stars found'.  I don't see an option in the batch script to de-select 'restrict to Previews'.  I don't see where I have any previews activated.  Weird.
\van

[TobiasLindemann]

hm, sorry your files are restricted to "Astrobin raw data members"

[vmacatee]

mmmm
try this link.
http://www.astrobin.com/rawdata/publicdatapools/13/
van

[Andres.Pozo]

I think the problem is that you haven't selected the option "CFA images" in BatchPreprocess. Since you haven't uploaded calibration frames I can not run the script. However, StarAlignment works well with these frames.

[vmacatee]

mmm.  CFA was ticked and the calibration/debayer seemed to work fine.  My issues starts when the script gets to the stacking point.
Interestingly, I just tried the script on a similar image run from a few prior and get the same thing.

Added the calibrated frames to the link...   http://www.astrobin.com/rawdata/publicdatapools/13/
Thanks for the help!  Im stumped.
van

[Juan Conejero]

Hi Van,

I still can't download your data without an AstroBin account. Without looking at the data, I can't diagnose the problem.

I don't see an option in the batch script to de-select 'restrict to Previews'.  I don't see where I have any previews activated.

That's because that option is not required. The BatchPreprocessing script loads the images directly from disk files so there can't be previews defined.

Just a wild guess: try setting the noise reduction parameter (Image Registration parameters panel on the light frames tab) to one or two. Let me know if this works.

[vmacatee]

Looks like I found the issue although I don't quite understand it...

I noticed the calibrated subs looked really bad so on the premise that the issue was upstream of Integration, began experimiting.

After trying all manner of different setting, I changed the Bayer/Mosaic setting from RGGB to BGGR (VNG unchanged) and that worked - at least in that the images stacked though they were mega-green.

Now I am wondering what deBayer setting I should be using with my Canon T3i DSLR and BackYard EOS...
Anybody know?

thanks
van

[pfile]

i think if you have to set the bayer pattern backwards then the fits reader direction is wrong…

rob

[Phil Leigh]

Looks like I found the issue although I don't quite understand it...

I noticed the calibrated subs looked really bad so on the premise that the issue was upstream of Integration, began experimiting.

After trying all manner of different setting, I changed the Bayer/Mosaic setting from RGGB to BGGR (VNG unchanged) and that worked - at least in that the images stacked though they were mega-green.

Now I am wondering what deBayer setting I should be using with my Canon T3i DSLR and BackYard EOS...
Anybody know?

thanks
van

BackyardEOS doesn't come into it. The Bayer pattern for all Canon RAW files is RGGB.

[pfile]

well it does if it is translating the images to FITS. which i can't remember if it can do or not, it's been a long time since i used a DSLR. if it's outputting CR2 then yeah, there's no ambiguity.

rob