Astrometric Observations of the Jovian Outer Satellites for 1990–1992

We have observed precise astrometric positions of the faint outer satellites of Jupiter J6–J12 with the Kiso 1.05 m Schmidt telescope. The observational period is from 1990 November through 1992 March. We discuss the postfit residuals after orbital improvement for our 1986–1990 observations and thereby emphasize the superiority of the intersatellite measures available only from wide-field Schmidt observations, which can cover all the satellites in a single plate.