On April 04, 2019 at 17:03 UTC the Russian "Soyuz-ST-B” rocket-carrier was launched from Kourou launch site in French Guiana. The rocket equipped with the "Fregat-MT” booster orbited 4 satellites. The Russian-built Soyuz rocket orbited O3b telecommunication satellites. The satellites are owned and operated by O3b Networks, which is a wholly owned subsidiary of SES S.A., one of the world’s leading satellite operators based in Luxembourg.