DP Glitch? Airmass changed to -1

Posted by BPVietje on Dec 03, 2017; 9:36pm
URL: http://astroimagej.170.s1.nabble.com/DP-Glitch-Airmass-changed-to-1-tp922.html

I've a dozen or so exoplanet transits through AIJ without a problem, but sometimes I can't detrend using airmass.  I check the FITS headers of my pipelineout images, and all the frames indicate an AIRMASS at mid-exposure of -1.0000

A look at the original image file indicates true airmass values ranging from about 2.3 to a low of 1.6, and up to a bit over 1.8 at the end of the sequence.  Somehow, in running through the DP module, the airmass in the pipelineout out images is being changed to -1.0000.

I have seen some threads addressing the inability to detrend using a constant value for airmass, but I'm hoping someone can help me understand how this is happening.  Do I have a corrupt installation in need of a fresh install?

Thanks and clear skies,

Brad Vietje
Newbury, VT