Astrometric CCD observations of the inner Jovian satellites in 1999 – 2000

This paper presents the results of observations of the inner Jovian satellites Thebe, Amalthea, Adrastea and Metis made in October–November 1999 and in November 2000. We provide ∆α and ∆δ of Thebe and Amalthea with respect to the Galilean satellites, while the positions of Adrastea and Metis are referred to either the Galilean moons or to Thebe or to Amalthea. All observed positions are compared with theoretical ones. Residual statistics show an inner accuracy of our observations in the range from about 0.1 to 0.9 arcsec. The dependence of the differences of the observed and calculated positions on the orbital longitude is presented for our observations of Adrastea and Metis.