Proton satellite
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 latest became Proton 4 launched on November 16, 1968 by Proton-K rocket with a booster and was in orbit for 250 days.
The Proton satellites were the source of the name for the Proton, which launched them as some of its first payloads.Photos
