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Kljub razvoju cenovno dostopnejših tehnologij izdelave in izstrelitve satelitov pa so stroški tovrstnih projektov še vedno visoki, tako pri strojni in programski komponenti satelita kot tudi podporni infrastrukturi za upravljanje z njim. Stroškom strojne komponente satelita in infrastrukture se ne da izogniti, razen na račun večjih tveganj za neuspešno izveden projekt, slabšo kakovost oz. okrnjeno izvedbo rešitve. Na drugi strani pa digitalna doba s svojim razvojem in dostopnostjo preko medmrežja ponuja možnosti za znižanje stroškov izdelave programske komponente vsaj določenih podsistemov oz. podporne infrastrukture. Naloga mojega diplomskega dela je torej raziskati možnosti za načrtanje programa za izračun trajektorije vesoljskega plovila z uporabo izključno odprtokodnih programskih orodij in programskih knjižnic, kot tudi praktična izvedba opisanega programa. Naloga programa je računanje stanj vesoljskega plovila v prihodnosti, iz podanih informacij o začetnem stanju, z uporabo r Despite the decreasing costs of satellite development and launch technologies, the expenditure of such projects is still high. This includes the hardware and software components of a satellite as well as the supporting infrastructure needed to operate it. The costs of hardware component cannot be avoided without inducing higher risks of an unsuccessful project, decreased quality or removing some of the components. However, the digital age, through its progress and Internet accessibility, provides us with possibilities of reducing costs for software development for at least some of the subsystems or supporting infrastructure. This thesis deals with researching the possibilities of developing a program that computes the future satellite positions by using exclusively open source tools and software libraries. It shall also result in its implementation. The task of the program is computing future states of the spacecraft based on the input initial state by using different computational