Thanks for the reply Jasem. I do see that I can manually enter a custom Key/Value/Comment into the ZWO CCD Driver in the INDI Control Panel, and that was going to be my next question about the syntax of specifying an INDI property to put into the FITS header for each image. It sounds like that is not possible yet.

If I can't get it into the FITS header, is there a way to log the temperature that the Observatory Module is displaying to a separate file that I could also save with my images?

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