Live coverage: 400th Proton rocket takes off with Russian satellite

After two of the last three Vega rocket launches ended in failure, Arianespace launched another Vega launcher from French Guiana at 9:50 p.m. EDT Wednesday (0150 GMT Thursday) with Airbus’s Pléiades Neo 3 commercial Earth observation satellite and five secondary payloads.

United Launch Alliance called off the planned liftoff of a Delta 4-Heavy rocket and a classified National Reconnaissance Office spy satellite from Vandenberg Air Force Base in California on Wednesday after indications of elevated hydrogen concentrations around one of the launcher’s main engines. Three previous launch attempts were scrubbed by technical concerns and bad weather.

It will take more than 12 hours from liftoff of the European Space Agency’s ExoMars Trace Gas Orbiter until engineers verify the mission is on track for Mars after a series of critical in-space maneuvers by the Proton rocket’s Breeze M upper stage.