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Two scientific and educational satellites SiriusSat-1 and SiriusSat-2, made in the CubeSat 1U format were launched 15.08,2018 fromthe ISS. Satellite manufacturing started in July 2017 during the project session in the educational camp Sirius (Sochi, Russia) with the participation of talented schoolchildren. Technical support of the project is provided by the Institute of Nuclear Physics of the Moscow State University (development of the payload, setting scientific tasks) and the Russian company Sputniks (development and manufacturing of the platform). The SiriusSat satellite payload is a detector of charged particles and gamma radiation in the energy release range 0.3 -3 MeV. The satellites were launched into an orbit with inclination of 52°. The main scientific goals are the study of fast variations of electron fluxes in the slot between the radiation belts as well as the study of the dynamics of particle and gamma-ray fluxes at very low orbits in dependence on geomagnetic conditions. The transmitter at a frequency of ~ 435 MHz is used. The daily data amount is ~ 200 kB. To solve scientific problems, both monitoring data (count ratesof particles every second) and detailed data on all interactions in the detector with a time resolution of 20 μs are transmitted, accumulated in the payload memory by a command that determines the time interesting to the researcher. The data are stored onSINP MSU server. They are available via web interface for students for the educational practice in space data analysis and for the scientific research.