Incorrect FITS headers after stacking

Posted by pdb on Jan 31, 2023; 2:05pm
URL: http://astroimagej.170.s1.nabble.com/Incorrect-FITS-headers-after-stacking-tp2119.html

Hi,

Using ASTROIMAGEJ 5.2.0.06 on Win10.

When stacking images using the "combine stack slices into single image"  in the resulting image, the Fits Header looks ok for DATE-OBS, JD-AVG en DATE-AVG in avg stacking (median gives invalid fits header and Fits header is wrong)

When saving the file in fits format, only JD-AVG is filled in.

Reading the file in another program (in this case Siril, but it is the same in DS9) gives this
----------------------------------
EQUINOX =               2000.0 / Equinox of celestial coordinate system
HISTORY  Stack of 10 images using method: Average Intensity
EXPTIME =               1200.0 / Total luminance exposure time in seconds
DATE-OBS DATE_OBS of last exposure in stack
JD-AVG  =    2459973.292005932 / Julian Day of the observation mid-point.
DATE-AVG
END
------------------------------------

Opening in AstroImageJ again shows the fields empty.


Paul De Backer