As well as optical and infrared observations, radar was used to probe the nucleus. These observations indicated that it was around 2-3 km across. The Sun was towards the lower right. Curved jets dust can be seen leaving the sunward side of the nucleus. Short vertical lines are background stars.
Bright points are cosmic ray hits on the CCD detector.
The Sun was towards the left, and the image shows a region around 36000km across. The nucleus is located in the largest white region around a quarter of the way along the image. Curved jets of gas and dust emanating at the nucleus are visible on the sunward side. Nine nuclear fragments are detectable with careful analysis, the largest of which appears at the centre of this image. The faint diagonal streaks are star trails.