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PI error, SPCC finds no stars

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#1 T~Stew

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Posted 25 April 2024 - 12:08 AM

Newbie alert, trying out PI for the first time, or perhaps I should say 20th time or so, still can't get anything to work. confused1.gif

 

My latest attempt was to use my mono stacks of NGC 1333 I did in Siril and just try and do some post-stacking things. I had already cropped and ran background extraction in Siril. Taking the 4 LRGB in PI I did LRGB combination which worked as expected. I did a plate solve which worked as expected. I tried SPCC and even set all the filter and camera parameters. However when it runs I get

* Extracting PSF signal samples
*** Error: No stars found (channel 0)
Reading swap files...
2174.424 MiB/s
<* failed *>

I've read countless threads on the matter but can't seem to figure it out. My image is still linear so its not that. I have the Giai DR3 pointing to the 16 files I downloaded, and DR3/SP pointing to the 4 files I downloaded. It took me hours to do all that, my broadband here is sub 5MB.

 

One odd thing I found is that SPCC seems to be looking for a wrong RA? When I do image solve it properly comes up with coord for NGC1333

Image Plate Solver script version 6.2.3
===============================================================================
Creation time ............ 2024-04-25 04:31:23 UTC
Creation software ........ PixInsight 1.8.9-2 / ImageSolver 6.2.3 (Linux)
Reference catalog ........ Gaia DR3
Linear transformation matrix (world[ra,dec] = matrix * image[x,y]):
-6.60664923e-06  -4.46706096e-04  +8.41003173e-01
+4.46496995e-04  -6.62514963e-06  -1.34753786e+00
WCS transformation ....... Thin plate spline
Control points ........... 7432
Spline lengths ........... l:2053 b:2060 X:2051 Y:2089
Surface residuals ........ l:0.156 px b:0.125 px X:0.141 as Y:0.194 as
Projection ............... Gnomonic
Projection origin ........ [3045.289231 1837.637818] px -> [RA:  3 29 05.342  Dec: +31 25 10.51]
Resolution ............... 1.608 arcsec/px
Rotation ................. 89.138 deg
Reference system ......... ICRS
Observation start time ... 2023-12-13 01:18:36 UTC
Observation end time ..... 2023-12-15 00:07:30 UTC
Focal distance ........... 482.33 mm
Pixel size ............... 3.76 um
Field of view ............ 2d 43' 14.0" x 1d 38' 29.2"
Image center ............. RA:  3 29 05.342  Dec: +31 25 10.50  ex: +0.007351 px  ey: -0.003439 px
Image bounds:
   top-left .............. RA:  3 32 57.946  Dec: +30 04 16.37  ex: -1.107492 px  ey: -1.542256 px
   top-right ............. RA:  3 32 53.254  Dec: +32 47 07.30  ex: +0.046075 px  ey: -1.140028 px
   bottom-left ........... RA:  3 25 23.928  Dec: +30 02 52.01  ex: -1.789826 px  ey: +0.047966 px
   bottom-right .......... RA:  3 25 06.012  Dec: +32 45 37.43  ex: +0.044056 px  ey: +0.064776 px

But if I am reading this correctly, when I run SPCC it has a different RA?

SpectrophotometricColorCalibration: Processing view: Image05
Writing swap files...
1547.093 MiB/s
* Retrieving Gaia DR3/SP database informationrun -x -r=m "/tmp/SPCC_T5Q30XY022N6.js"Processing script file: /tmp/SPCC_T5Q30XY022N6.jsData release .......... Gaia DR3SP
Database files ........ 4
Magnitude range ....... [-2.00,25.59]
Wavelength range ...... [336.00,1020.00] nm
Spectrum step ......... 2.00 nm
Spectrum count ........ 343
Spectrum resolution ... 8 bits* Searching catalog spectrum sourcesrun -x -r=m "/tmp/SPCC_FXSEIWDHWYS6.js"Processing script file: /tmp/SPCC_FXSEIWDHWYS6.js* Searching for optimal magnitude limit...Limit magnitude: 25.94run -x -r=m "/tmp/SPCC_06263TYOIVYR.js"Processing script file: /tmp/SPCC_06263TYOIVYR.js
Executing Gaia DR3SP search command:
Center Right Ascension .....  52.272257530 deg
Center Declination ......... +31.419582860 deg
Search radius ..............   1.585053020 deg
Magnitude low limit ........ -1.500
Magnitude high limit ....... 25.940
Source count limit ......... 4294967295
Required flags ............. 00000000
Inclusion flags ............ 00000000
Exclusion flags ............ 00000001
* Using 8 parallel search threads.Search results:
Total sources .............. 1884
Excess count ............... 0
Reject count ............... 121466
Total search time .......... 162.398 ms
Total I/O time .............  2.608 ms
Total I/O operations ....... 592
Total uncompression time ... 132.442 ms
Total decoding time ........ 20.133 ms
* Output binary file generated: /tmp/Gaia_SP_7SPO6HUKY9YW.binExtracting catalog star spectrum data: done927 catalog sources found.Saturation threshold: 0.7500
* Extracting PSF signal samples
*** Error: No stars found (channel 0)
Reading swap files...
2174.424 MiB/s
<* failed *>

I'm at a loss here. Anyone shed some light?


Edited by T~Stew, 25 April 2024 - 12:11 AM.


#2 fmeschia

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Posted 25 April 2024 - 12:35 AM

No the RA is the same, it’s just expressed as hours in one case, and as degrees in the other.


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#3 Marcelofig

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Posted 25 April 2024 - 01:05 AM

I don't know exactly why SPCC might be failing, maybe you can upload the problematic file to some cloud service and post the link here (make sure it's public) to see if anyone else has the same problem.

 

You mention having half processed the files in Siril, PI doesn't really like that, it prefers everything to be done in house. Another suggestion is to do a quick processing from scratch with a few files in WBPP and see what happens. It could also be that those 4 GAIA DR3SP files are not enough for your particular case.

 

And related to the last point, make sure that both GAIA databases are NOT stored inside the PI folder, as they will be deleted during the installation when there is a PI version.



#4 pyrasanth

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Posted 25 April 2024 - 06:38 AM

Under the SPCC signal detection change it from the default 40 to say 5. See if that works. It does for me when I get that error.


Edited by pyrasanth, 25 April 2024 - 06:39 AM.


#5 T~Stew

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Posted 25 April 2024 - 08:38 AM

No the RA is the same, it’s just expressed as hours in one case, and as degrees in the other.

Gotcha a missed that, I've never happened to seen RA expressed in degrees before. Well there goes that idea.

 

 

I don't know exactly why SPCC might be failing, maybe you can upload the problematic file to some cloud service and post the link here (make sure it's public) to see if anyone else has the same problem.

 

You mention having half processed the files in Siril, PI doesn't really like that, it prefers everything to be done in house. Another suggestion is to do a quick processing from scratch with a few files in WBPP and see what happens. It could also be that those 4 GAIA DR3SP files are not enough for your particular case.

 

And related to the last point, make sure that both GAIA databases are NOT stored inside the PI folder, as they will be deleted during the installation when there is a PI version.

Well I've heard before some stack in Siril because its quicker, so I know its possible. But I'll try WBPP again with smaller file set to see if I can get something to work.

 

All the Giai database files are in my downloads directory, so no worry about PI deleting them. I suppose I could've hit one of the spots it doesn't cover in the small database? I'm using a fairly wide field though, AT80EDT refractor at 1x (~480mm) and 2600MM.

 

 

Under the SPCC signal detection change it from the default 40 to say 5. See if that works. It does for me when I get that error.

Did you mean the other way around? Mine is already set to 5. I'll upload a shot of the tool for reference, I changed the filter and QE values at thye top, but I think everything else is default.
 



#6 T~Stew

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Posted 25 April 2024 - 08:54 AM

Forgot I was going to upload a shot of the settings used in SPCC for reference...

 

Screenshot from 2024-04-25 09-26-59.png



#7 T~Stew

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Posted 25 April 2024 - 09:02 AM

And here is just a quick screenshot of the file with STF. Plenty of stars, no significant issues I can see. Processing it in Siril was fine and made a decent image... one of my better recent-ish ones that came out well I thought would be a good comparison to see what I could do in PI

 

Screenshot from 2024-04-25 09-58-48.jpg

 

The finished file fully processed with Siril, Darktable and Gimp is on my a-bin as well at https://www.astrobin.com/dbx2eh/

 

I'm not too worried about uploading the full file since I've already processed this one and just wanted to do a quick compare. If anyone has some ideas that's great otherwise I think I am going to try some other files and/or wbpp again on a smaller dataset so I doesn't take hours just to crash at the end lol.


Edited by T~Stew, 25 April 2024 - 09:06 AM.


#8 Navy Chief

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Posted 25 April 2024 - 10:20 AM

It sounds like one of the processes you ran outside of PI modified the PSF for the stars in the image in a way that PI no longer recognizes them as stars. Start with a fresh raw linear image and run SPCC very early in your processing.

#9 T~Stew

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Posted 25 April 2024 - 11:15 AM

It sounds like one of the processes you ran outside of PI modified the PSF for the stars in the image in a way that PI no longer recognizes them as stars. Start with a fresh raw linear image and run SPCC very early in your processing.

The only thing done to the raw linear image outside of PI was gradient extraction and crop on the individual mono channels, but that wouldn't really seem to effect the PSF?. Those are the first two processes I run on about everything and then save. Not sure if I have the file before gradient extraction but I'll check later when I get back home.


Edited by T~Stew, 25 April 2024 - 11:16 AM.


#10 T~Stew

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Posted 25 April 2024 - 10:11 PM

I didn't have much time to play with it today, but I did grab another file to try. I had recently done the Whale and Crowbar with dslr and had the stacked result saved. I opened it in PI and did a crop, gradient correction, plate solve, and SPCC and it worked fine. So at least it works on my machine and the problem I had above has to be something with that file in particular.

 

But I ran into another issue, I had just installed trial versions of all the RC astro stuff, and when I rebooted today they were gone. Guess I got some more figuring out to do. But tomorrow I'm rebuilding a motor, and hopefully getting back in the car prior to Monday, so not much time these next few days then its back to work.




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