Quote Originally Posted by Bob Denny View Post
ACP uses PinPoint to add things to FITS. PinPoint has mapped properties for some common FITS fields. Each time PinPoint changes the FITS data it also writes a HISTORY record to FITS. OBJCTHA is not one of the things that ACP adds.
I see you've brought this over to the Maxim side though it appears to me to be an ACP issue in that it does overwrite OBJCTHA in a different format without leaving a comment about it.