‘We Demonstrated That HSE University Can Not Only Build a Satellite, but Maintain Its Operation’
The first HSE University satellite has completed its work in orbit after more than 35,000 hours of trouble-free operation, one billion kilometres travelled (24,600 orbits around the Earth), and hundreds of full-frame shots taken of the Earth's surface across an area of 320,000 km2. The HSE News Service shares the results of the satellite’s mission and the team’s plans for the near future.
The CubeSX-HSE and CubeSX-Sirius-HSE satellites were the first CubeSats launched by HSE University and the Sirius Educational Centre. The global SatNOGS catalogue now lists both devices as ‘Decayed,’ officially signalling the completion of a four-year orbital mission—three times longer than their formal one-year warranty and almost double the statistically reliable limit for standard CubeSat platforms.
Launched on March 22, 2021, on a Soyuz-2.1 commercial flight with a Fregat unit, the pair of three-unit satellites entered a Sun-synchronous orbit about 550 km high alongside three dozen more satellites. The initial estimated life of the OrbiCraft-Pro platform—12 months of active operation—was chosen as a compromise between expense and statistics; according to industry estimates, the probability of maintaining the functionality of a classic CubeSat a year after launch does not exceed 60%. This makes the final outcome all the more impressive: a four-year, trouble-free marathon spanning about one billion km (24,600 orbits), the equivalent of several dozen round trips from Earth to Mars. The final descent began in April–May 2025, when the perigee of both vehicles dropped below 200 km; the calculated models showed a linear increase in aerodynamic drag.
The main scientific programme was carried out by the world's first flat harmonic diffractive lens, with a diameter of 10 mm and embedded in a 3D-printed metal camera box. A series of calibration surveys proved that ultrathin optics produce an image comparable to classical refractive optics; the results are described in an article in Remote Sensing 14 (9): 2230 (2022). In total, the pair of satellites collected more than 320 full-frame shots of the Earth's surface, from the cellular clouds of the Barents Sea to the spring flood on the Volga, with a total area of over 300,000 km2, a milestone recorded by the HSE team at the three-year mark of the mission.
The reliability of the on-board electronics surpassed even optimistic forecasts: the total operating time of critical modules exceeded 35,000 hours without a single emergency restart. The chosen form of open channel, an AX.25 amateur radio format in the UHF range, played an important role. This meant that only the SatNOGS network of ground stations was able to receive and decrypt over 4,000 sessions (three leading observers monitored the broadcasts almost daily until the satellites’ orbits decayed), and each successfully decoded transmission appeared in real time in the open SatNOGS API.
The mission also served as a vibrant educational platform. Over the past four years, more than 15 students have taken part in the work of the MIEM Mission Control Centre, and Sirius students have had an opportunity to plan real orbital experiments for the first time, from drawing up daily transmission schedules to processing received telemetry. This experience gave rise to the idea of annual launches: in 2022 and 2023, CubeSX-HSE-2 and CubeSX-HSE-3 went into orbit with new payloads and improved modules.
The CubeSX-HSE and CubeSX-Sirius-HSE have achieved all their stated goals: demonstrating the performance of ultralight diffraction optics, collecting hundreds of valuable images, serving as an open data showcase for amateurs and professionals, and most importantly, training a new generation of small-spacecraft engineers. The CubeSats burned up at an altitude of about 80 km, but the code, data, and accumulated experience have already been passed on to the next participants of the Space-π programme. For them, the four-year record of the first university satellites is no longer an unattainable dream, but a new bar to pass.
Meanwhile, CubeSX-HSE-3, launched in June 2023, continues to operate in orbit. It transmits thousands of messages daily, and its telemetry confirms that the on-board electronics are operating normally and the solar panels are charging the batteries stably.
A new satellite will be sent into a Sun-synchronous orbit in the fourth quarter of 2025, while a sixth satellite focused on experiments with new materials is expected to be launched in 2026—thus tripling the amount of scientific data produced.
Dmitrii Abrameshin
Dmitrii Abrameshin, Head of the Mission Control Centre, Leading Engineer at the HSE Laboratory of Space Vehicles and Systems' Functional Safety, noted: ‘We demonstrated that HSE University can not only build a satellite, but also maintain its operation for a long time. CubeSX-HSE-3 has started providing fresh data for our archive, and the devices that we plan to launch in 2025 and 2026 will be capable of onboard data processing and prove that even a CubeSat can become a full-fledged orbital laboratory.’
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