Nick – I’m beginning to see why Comphot is the best way of doing comet photometry and my lack of understanding. Finding the extent of the coma is too subjective in my technique but useful for a quick analysis.
The way I normally work with ASTAP is to use a small number of images in the stack so as not to trail too much for a magnitude measurement. Coma size is measured using just one frame. Not ideal for a good SNR though. Also basically using Han’s technique that he shows in the video, removing any stars from the measurement area.
Any further forward on porting this to Windows and a GUI?
Thanks
Mark