iraf.net

When processing a time series of a slow moving (angular) asteroid, the resulting median combine image
shows a trail over the path of the asteroid.Can someone confirm this as expected and desired behavior (in principle) where the tails of the psf for the
asteroid are near the median background value (pixel by pixel) and overlap or affect the median value in the
final image.Though it would be rather tedious, could this be verifed manually by examining value sequences for individual
pixels of the track and determining the pixel distance of the median value selected from the center of the
asteroid in the same frame?I would like to verify manually (once only) that if the pixel value selected as median value for a particular pixel
come from image n of the stack, that the asteroid is an appropriate distance from that pixel to present a total
flux (background + asteroid), and thus show causation for the value selection, and by extension for the
appearance of an anomalous structure in the final image.Of course the images were previously corrected with bias, dark, and flat field frames from that run, then aligned
and trimmed to a section present in all data frames prior to the median combine operation.