[Aavso-photometry] Cosmic Rays

[Ben Davies]

Here is a method I've come up with to analyze cosmic ray hits in 
photometric images:

- Make a median of all images.
- Subtract this median from each of the images to get a set of images 
that contain all the artifacts.
- Average combine (or add, depending)  the artifact set.  Now one image 
contains the defects and another contains the signal..
- Blink the averaged image against the median.

If no artifacts fall on or near the stars you are interested in, the job 
is done.
If an artifact does coincide, you just track down the offending image.

I'm probably just stating the obvious here, but it took me a while to 
figure it out

Ben Davies
http://ben.davies.net/