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Hello,I'm relatively new to IRAF, so hopefully this question hasn't been asked a million times!I'm looking at star-field images from CFHT. I have a bunch of candidate objects that are potentially asteroids or comets. Their long axes (along direction of motion) are not along one line or one column. What I need to do is measure the FHWM of the object perpindicular to the direction of motion. So, I need a tool where I can choose the axis to measure FHWM...is there one? I also need to be able to fit it with a gaussian.I know in IMEXAMINE, you can plot along different angles (i.e. using the u or v keys), but I can't figure out how to also fit it with a gaussian - which you usually do with the j & k keys, but those seem to be only used when plotting along one line or column.Any help would be much appreciated in order for me to keep my sanity Alyssa

Hi Alyssa,I'm not aware of a specific tool that will do what you want, but it should be possible to script a task yourself to do this. What I imagine is a task that displays an image and uses RIMCURSOR to read two cursor positions defining the end of the trail. From these you can calculate a position angle and then use ROTATE to align the trail along a column or row where you can use the j/k keys in IMEXAM. The script could loop over lists of images and while doing this automatically is tougher, it should still save you lots of time. If you're not familiar with scripting see the 'Script Programmer's Guide' on the Docs page. Hope this helps, write back if you still have questions.Cheers,
-Mike