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A concept of the ground-based optical astronomical observations efficiency isconsidered in this paper. We believe that a telescope efficiency can beincreased by properly allocating observation tasks with respect to the currentenvironment state and probability to obtain the data with required propertiesunder the current conditions. An online observations scheduling is assumed tobe essential part for raising the efficiency. The short-term online schedulingis treated as the discrete optimisation problems which are stated using severalabstraction levels. The optimisation problems are solved using a paralleldepth-bounded discrepancy search (PDDS) algorithm [13]. Some aspects of thealgorithm performance are discussed. The presented algorithm is a core ofopen-source chelyabinsk C++ library which is supposed to be used at 2.5 mtelescope of Sternberg Astronomical Institude of Lomonosov Moscow StateUniversity.

Astronomical observation tasks short-term scheduling using PDDS algorithm