He also recorded the first known precovery images of Comet Shoemaker-Levy 9 with his private 10-inch (25 cm) diameter telescope on March 15, 1993, ten days before the official discovery of the comet.
De asemenea a înregistrat prima imagine precovery a cometei Shoemaker-Levy 9 cu un telescop privat cu diametrul de 10-inch (25 cm) la 15 martie 1993 înainte de descoperirea oficială a cometei.