Modern astrometric projects require precise positional measurements of objects down to magnitude 20m–22m. For ground-based observations, this is possible by the use of astrographs with apertures 1 meter or more with precise ...

A new method of determination of planetocentric coordinates of albedo features on the visible disc of a spherical planet is offered under various conditions of its illumination. The method is aimed for processing the images ...

The investigations of the atmospheric turbulence instability are carried out. The observations of different stars and different positions of stars in the sky performed with the AZT-2 telescope (diameter of 0.7 m) of the ...

Results of CCD frames of star fields processing obtained by two ways, are analyzed. In the first case (a traditional method) the frame of flat field are used. In the second one the own large-scale flat field is obtained ...

The description of two-inch glass filters of the Vilnius UPXYZVS photometric system, which are made at the Main Astronomical Observatory of NAS of Ukraine for AltaU42 CCD camera with format of 2048×2048 pixels, is presented ...