The Proton was a model of Soviet Earth observation satellites. The maximum mass was about 17 tonnes. Four Proton satellites were launched between 1965 and 1968. The satellite was developed by NPO Mashinostroyeniya. The aim of the project was to study high and ultra-high energy particles.
The Proton satellites were the source of the name for the Proton (rocket family), which launched them as some of its first payloads.
- The history of "NPO Mashinostroyenia"
- The INCA Project, Ionization-Neutron CAlorimeter - a modern continuation of Proton experiment project at Institute for Nuclear Research of Russian Academy of Sciences website[dead link]
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