Japan launches second flagship H3 rocket

Japan’s space agency has successfully launched a second test model of its new flagship rocket H3, in a welcome boost to its space program after last year’s inaugural flight failed.

The launch further burnishes the country’s space credentials after the historic “pinpoint” moon landing of Japan’s Slim spacecraft last month, according to The Guardian.

The Japan Aerospace Exploration Agency (Jaxa) and primary contractor Mitsubishi Heavy Industries have designed the H3 to replace the two-decade-old H-IIA, hoping that its lower costs and greater payload capacity will help them win launch orders from global clients.

The H3 had a “successful liftoff” at 9.22am Tokyo time (0022 GMT) on February 17 and was “on course” with its engines properly working, Jaxa said in a live broadcast that showed scientists clapping and hugging each other at Tanegashima Space Centre.

The rocket has released one micro-satellite, is due to release another, and then about two hours after liftoff will release a dummy satellite.

The H3’s first flight in March ended up with ground control destroying the rocket 14 minutes after liftoff because its second-stage engine failed to ignite. Jaxa listed three possible electrical faults in a review released in October but could not identify the direct cause. The failure caused widespread delays in the country’s satellite and planetary exploration plans.

Jaxa hosted a press conference on February 17.

The 63-metre (297ft) H3 is designed to carry a 6.5 metric ton payload into space and reduce per-launch cost to as low as 5bn yen ($33m) by adopting simpler structures and automotive-grade electronics. By comparison, the H-IIA costs about 10bn yen per launch.

The government plans to launch about 20 satellites and probes with H3 rockets by 2030. The H3 is scheduled to deliver a lunar explorer for the joint Japan-India Lupex project in 2025 as well as cargo spacecraft for the US-led Artemis moon exploration programme in the future.

Satellite launch demands have soared thanks to the rise of affordable commercial vehicles such as SpaceX’s reusable Falcon 9, and a number of new rockets are being tested this year.

Last month marked the successful inaugural flight of the United Launch Alliance’s Vulcan rocket, a joint venture between Boeing and Lockheed Martin. The European Space Agency also plans to launch its lower-cost Ariane 6 for the first time this year.