bugGNU Astronomy Utilities - Bugs: bug #63644, WCS Library not recognizing raw...

 
 

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bug #63644: WCS Library not recognizing raw HST WCS

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Thu 12 Jan 2023 01:01:13 AM UTC
   
 
Category:  Libraries Severity:  3 - Normal
Item Group:  Output not reasonable Status:  Confirmed
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Thu 12 Jan 2023 01:01:13 AM UTC, original submission:  

When we run any Gnuastro program on raw HST images, we get WCSLIB errors and the WCS is not loaded:


$ wget -Oj9en0pnaq_flc.fits 'https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:HST/product/j9en0pnaq_flc.fits'

$ astarithmetic j9en0pnaq_flc.fits
astarithmetic: gal_wcs_read_fitsptr: (warning) wcsfix status for cdfix: -1
astarithmetic: gal_wcs_read_fitsptr: (warning) wcsfix status for obsfix: -1
astarithmetic: gal_wcs_read_fitsptr: (warning) wcsfix status for unitfix: -1
astarithmetic: gal_wcs_read_fitsptr: (warning) wcsfix status for spcfix: -1
astarithmetic: gal_wcs_read_fitsptr: (warning) wcsfix status for celfix: 5
astarithmetic: gal_wcs_read_fitsptr: (warning) wcsfix status for cylfix: -1
astarithmetic: gal_wcs_read_fitsptr: WCSLIB warning: wcsset error 5: Invalid parameter value
 - j9en0pnaq_flc.fits (hdu 1) is read.
 - Write (final): j9en0pnaq_flc_arith.fits
Arithmetic finished in 0.110952 seconds


This was originally reported by Alex Borlaff in a post to bug-gnuastro. As mentioned in later messages of that mail series, we should confirm which one of these scenarios (or maybe anther scenario) is causing this problem:

  • it is a problem in the way we use WCSLIB in Gnuastro.
  • it is a non-standard usage of WCS keywords in the HST pipeline.
  • it a bug in WCSLIB.
Mohammad Akhlaghi <makhlaghi>
Group administrator

 

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