The Japan Aerospace Exploration Agency's flagship heavy lift launcher placed six satellites in orbit on Thursday, clearing a December 2025 failure and validating the configuration it needs to scale beyond earlier two engine missions.
Japan's H3 rocket lifted off at 8:54 p.m. EDT on Thursday, June 11 (00:54 GMT June 12) from Tanegashima Space Center on Japan's southeastern coast, and placed all six onboard payloads into their planned orbits, according to a Japan Aerospace Exploration Agency (JAXA) release cited by Space.com.
The flight was H3's eighth liftoff overall and the first time the rocket flew with three LE-9 engines clustered on its core stage, the configuration JAXA needs to scale lift capacity beyond the two-engine core flown on every previous mission. Two of those earlier flights ended in failure: the rocket's debut in March 2023, and a December 2025 mission in which a damaged payload adapter destroyed the Michibiki 5 navigation satellite along with the second stage's propellant tanks.
The six payloads riding Thursday's launch were PETREL, an Earth-observation smallsat; STARS-X, a technology-demonstration CubeSat; BRO-22, a university-built research cubesat; VERTECS, a vehicle-tracking experiment; and HORN-L and HORN-R, a pair of small satellites flying complementary instruments. All six separated from the second stage on schedule, per JAXA.
H3 is Japan's flagship heavy-lift successor to the just-retired H-IIA, developed by JAXA with Mitsubishi Heavy Industries around the LE-9 engine family. The three-engine variant is the path the program has needed to compete on cost per kilogram and to serve larger government and commercial payloads, including geostationary-capable missions the two-engine core cannot reach.
The Space.com write-up carries a brief inconsistency worth flagging for reconciliation against the JAXA press kit: one graf refers to the flight as H3's first launch of 2027, while the rest of the article and the liftoff timestamp place it in June 2026.
The successful return to flight clears the December 2025 failure from H3's record, validates the three-engine core on orbit, and reopens the rocket's 2026 manifest for commercial and government customers who have been waiting on a working national launcher.