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| Sherry |
02/14/2012 07:39PM (Read 1332 times)
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Status: offline
Registered: 06/15/2011
Posts: 10
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IRAF is giving me apall centers that are shifted by ~200 channels.
This is only happening with asteroid spectra as apall is reading out the correct cenrtwertd for bstandard star spectra. What is going on?
linux 64 bit iraf v2.15.1a
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| valdes |
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02/14/2012 07:39PM
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 Status: offline
Registered: 11/11/2005
Posts: 728
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Hello,I need some more information to try and understand this. It is not clear if you are finding the defined apertures are off or that the extractions are off. Could you send a long image header listing of the image. In particular, I suspect it has something to do with using data which was previously extracted as a subsection of another image. This would be apparent in the presence of keywords LTVi/LTMi_j. If that is it then there is an easy solution to remove these or use the task "wcsreset". Other useful information are parameter listings and the database file. While I can can generate a test file from a header listing if I need something to actual see where you are trying to define apertures I might need the image data. But for now just send the header listing.Yours,
Frank Valdes
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apall command shifting the aperture
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