Problem with PCC not finding stars to color calibrate

Reggie Jones

Hi.  When I use PCC to color calibrate my image, I get the error listed below.  I've tried changing limiting magnitude settings and I also checked the FITs header but didn't see any problems.  Not sure what the problem is with the image or what to try next.  The data is Telescope Live 1-Click dataset of M94.  I've put the xisf file in a shared Dropbox folder that you should have access to via ngc1535@caelumobservatory.com but please let me know if you don't see it.

Suggestions?

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Reference image: PCC_B_FOVCNGK7ETGA
Star search aperture: 6.06 pixels
1 view(s)
0 star(s)
0 PSF fittings
*** Error: Failure to process image file '/var/folders/77/yfgx2cv943x2gdzbhpjzk2hr0000gn/T/PCC_B_FOVCNGK7ETGA.xisf': Could not locate any stars in the image
*******************************
Photometry process finished:
0 of 3 images processed successfully.
3 images with errors.
3 errors and warnings.
*** Error: Failure to calculate photometry: Image17
Reading swap files...
3946.977 MiB/s
<* failed *>

BlockHead

Yes, there are a few areas of the sky, particularly in the northern galactic latitudes for which the catalogs are not complete. I suspect this is the issue.... 

Indeed... I tried. For future reference you left out the important part of the log on the console!

This part of the key:

* Using an automatically calculated limit magnitude of 27.91.

Executing APASS DR10 search command...

7 sources found.

Catalog APASS DR10 (XPSD): 0 objects inside the image.

Catalog stars: 7

Star search aperture: 6.06 pixels

1 view(s)

0 star(s)

0 PSF fittings

*** Error: Failure to process image file 'C:/Users/ngc15/AppData/Local/Temp/PCC_R_N10PPKH05FDK.xisf': Could not locate any stars in the image

APASS the photometry catalog used to measure the colors. Your image did correctly solve with the other catalog. 

I would suggest for this image, use the two step "manual" color calibration method. It will work out just fine.

-the Blockhead

Reggie Jones

Thanks Adam; sorry I thought I'd captured everything in the screen print.  I didn't think of an issue where catalogs were't complete but it makes sense.

Reggie