VZLUSAT-1 was a Czech technology demonstration satellite operated in low Earth orbit between 2017 and 2023 by the Prague-based company VZLU Aerospace. The 2U-type CubeSat was testing various spaceflight technologies including a miniaturized X-ray telescope and composite material radiation shielding. It was also performing scientific measurements of oxygen concentration in Earth atmosphere. The satellite was launched in June 2017 by the Indian PSLV-XL rocket, operated successfully in space for almost six years and more than 33,000 orbits, and ended its mission with destructive re-entry in June 2023. At that time, it was the longest operating Czech satellite to date and the second longest operating 2U CubeSat ever.Robust attitude control of cubesat spacecraft (archived)
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