Astronomy & Astrophysics

Table 1: Observational information for each night. The mean exposition time is given in column T, in seconds. N is the number of obtained frames. K gives the number of reference stars used in the astrometric calibration of the frames. The dimension of the CCD in pixel is given in column CCD and the length of side of the square pixels in micrometer are in column Pixel. For each frame and for the directions x and y, the astrometric calibration gives a standard deviation of the reference star residuals. The column $\sigma$ give the mean of theses standard deviations over the frames of the corresponding night in arseconds.
Table 3: a) Observed minus calculated statistics of Amalthea for each night. The units are arcseconds and $\overline {\alpha }$ , $\sigma _{\alpha }$ , $\overline {\delta }$ , $\sigma _{\delta }$ are the means and the standard deviations for the residuals in right ascension and declination. N is the number of observations. In the first column the date of the observation is given and in the last line the statistics for all the observations.
Table 3: b) The same as Table 3a for Thebe.
Table 3: c) The same as Table 3a for Amalthea minus Thebe.