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The privately-built lunar lander Beresheet today successfully entered lunar orbit.
They achieved this by completing an engine burn that changed their Earth orbit to an elliptical lunar one.
At 5:18 p.m. Israel time on April 4, the spacecraft’s engine activated for six minutes and reduced its speed by 1,000 km/hour, from 8,500 km/hour to 7,500 km/hour, relative to the moon’s velocity. The maneuver was conducted with full communication between Beresheet’s control room in Israel and the spacecraft, and signals in real time match the correct course. In the coming week, with expected intense engineering activities, many more maneuvers will take Beresheet from an elliptical to a round orbit, at a height of 200 km. from the moon. The maneuvers will aim to reduce the spacecraft’s distance from the moon and reach the optimal point to conduct an autonomic landing in the Sea of Serenity in the evening Israel time, April 11.
You can see a video of their mission control at the completion of this burn here.