Photos: Atlas 5 rocket aims for International Space Station

Rocket Lab’s first launch of the year lifted off Thursday at 7:27 p.m. EDT (2327 GMT) after a four-day delay to replace a video transmitter and wait for improved weather. The company’s Electron rocket launched from Mahia Peninsula on New Zealand’s North Island with a technology demonstration satellite for DARPA, the U.S. military research and development agency.

Arianespace has split its third order of Vega rockets from Italy’s Avio between old and new versions of the solid-fueled booster, as officials prepare to build a final batch of around 18 Ariane 5 rockets before switching to the next-generation Ariane 6 in the early 2020s.

Arianespace has received its first two confirmed launch contracts for Europe’s new Ariane 6 rocket, and the company recently announced four more launch bookings to loft communications and weather satellites into orbit aboard Ariane 5 and Soyuz boosters from French Guiana.