These two images were obtained by F.Lisi and P.Patriarchi
on March 25, 1996, in the J band with an exposure time of 30 sec.
The bright spot on the upper left is the comet nucleus, while
a fragment is visible near the center of each image.
Comparing the two images it is possible to see that the
fragment is moving out from the comet nucleus at a speed of 17 m/sec.
(Here a postscript version of this image)