29.06.2025

Liftoff occurred at 12:33 p.m. EDT on Saturday (June 28).

Japan launched its 50th and final H-2A rocket carrying the GOSAT-GW satellite on Saturday, June 28, 2025.(Image credit: JAXA)

Japan launched a dual-purpose satellite to monitor sea temperature and greenhouse gases.

The Japan Aerospace Exploration Agency (JAXA) on Saturday (June 28) conducted its 50th and final launch of the H-2A rocket, taking the GOSAT-GW dual-purpose satellite to space. The mission lifted off from Yoshinobu Launch Complex (LP-1) at the Tenegashima Space Center in Japan at 12:33 p.m. EDT (1633 GMT; 1:33 a.m. June 29, local time in Japan).

The Greenhouse Gas and Water Cycle Observation Satellite (GOSAT-GW) is the latest in Japan's efforts to observe changes in water cycles and greenhouse gases. GOSAT-GW has joined its predecessors in Earth orbit: GCOM-W2, which launched in 2012 and is known as "SHIZUKU," and GOSAT-1, which launched in 2009 and is known as "IBUKI."

GOSAT-GW is equipped with two main instruments.

The first is known as the Advanced Microwave Radiometer (AMSR), and will measure water cycles and fluctuations in sea surface temperatures. The second is the Greenhouse Gases Observation Sensor (TANSO), and will monitor components such as carbon dioxide in Earth's atmosphere to measure climate change.

Japan's H-2A rocket, built for JAXA by Mitsubishi Heavy Industries, was capable of launching payloads into a geostationary orbit around Earth and to orbit around the moon. It also launched the Akatsuki spacecraft to study Venus in 2010, though the spacecraft failed to properly enter Venusian orbit.

H-2A first launched in 2001. During its nearly 25 years in operation, the rocket experienced only a single launch failure, giving the vehicle a 98% success rate. After 50 missions, the launch vehicle is now being retired to make way for Japan's H3 rocket, which offers comparable performance at a lower cost.

Quelle: SC