Hongjian Pan

Observation of an explosion in Comet Hale-Bopp

Using the Shanghai Observatory 1.56-m telescope and a Series 200 CCD camera we discovered an explosion on Comet Hale-Bopp between 1996-04-21 and 1996-04-23. On 22, the magnitude was 0.2 mag brighter than on 21, and it was more or less back to the previous brightness on the next day. The half-intensity diameter of the head showed corresponding variations.

Observations of the collision of Comet SL9 with Jupiter

Abstract Six impacts were observed with the 1.5m telescope and a CCD at Shanghai Observatory Sheshan Station. We give a light curve of the flash on Europa caused by the impact of fragment K12 and four post-collision photographs of Jupiter.