A very large dark ring is seen surrounding the impact site which moved
onto the limb at about 10:02 UT 21 July. (perhaps the L site?) The ring
extended beyond the south pole, and nearly to the equator, imaged using
a Bessell blue filter and CCD detector. The central impact site was
also dark in this filter. Where this ring intersected Jupiter's dark
band at about 20 degrees south latitude (belt? zone?) the methane image
shows a bright spot. The impact site is not bright in the methane (8900
A, 300 A wide) This complex was seen to move across the face of the
planet in successive images taken between 9:24 and 10:38 UT. By 12:46
poor seeing prevented seeing it. This feature was marginally visible in a
narrowband sodium filter, but not in a Cousins R filter. These
observations are part of the Comet Impact Network Experiment headed by
Steve Larson of the University of Arizona.