The CORONAS spacecrafts are based on the unified AUOS-SM platform. This is the fourth
generation of Automated Universal Orbital Stations, designed for complex
studies of the physical processes that occur on the surface of the Sun and in its interiour.
The platform was designed by the State Design Bureau "Yuzhnoye" (Dnepropetrovsk, Ukraine).
Platform's weight is about 2 tonnes and it usually carries 300-400 kg of scientific payload.