Hi Paul, for small objects like Uranus you are going to have to reduce the value of Min Pixels. Min Pixels is the minimum number of pixels that pass the threshhold (ppmcentre default is 40) for the file to be processed. The ppmcentre (and PCFE) default Min Pixels value is 250. I'm guessing that Uranus is smaller than 250 pixels in your image.
Here's a quote from iceman re using ppmcentre/PCFE on Uranus
Quote:
I've also used -minpixels=80 for a small target (like Uranus).
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