Between October 1994 and July 1995 we took images of double and multiple
stars with a CCD camera of ST-6 type at the Belgrade Observatory. The
camera was attached to the Zeiss 65/1055 cm Refractor. Images of 84
systems, i.e. 123 pairs, were obtained successfully. On the average each
pair was taken 4.5 times and every image was measured by the authors. The
camera pixel has a rectangular form with dimensions along the axes (x,
y) as following:
Before the pixel dimensions were derived, the focal length of the instrument had been established. It was obtained from the ephemeris values of the components separations for four orbital pairs and five ones with rectilinear trajectory (Pavlovic et al. 1996). For all nine pairs we found new orbital elements.
The focal length is found to be
In another paper (Popovic et al. 1996) was analyzed the accuracy of the
measurements for the pairs communicated here. In the position angle the
residual are approximately 
and for the separations about 
in the case of the pairs with 
. We find that the
internal agreement of the measurements concerning the same material is high
for all the three authors by whom the measurements were performed.
This series is the 49th contribution of the Belgrade Observatory to the
measurements of double and multiple systems. All earlier series have been
realized by using the filar micrometer attached to the Zeiss 65/1055 cm
Refractor of the Belgrade Observatory. Contribution No. 48 was communicated
in 1994 (Popovic & Pavlovic 1994).