GOSAT-GW

On July 1, 2025, JAXA stated that IBUKI GW (GOSAT-GW) would move to an initial functional verification operations phase lasting approximately three months.

On June 30, 2025 at 14:57 JST, JAXA confirmed successful deployment of the AMSR3 antenna on IBUKI GW (GOSAT-GW) with images received at the Kiruna Station in Sweden.

On June 29, 2025 at 02:12 JST, telemetry from IBUKI GW (GOSAT-GW) was received at the Troll Satellite Station in Antarctica indicating the satellite was in Sun Acquisition Mode and nominal condition.

On July 1, 2025, JAXA confirmed completion of the critical operations phase for IBUKI GW (GOSAT-GW) after telemetry confirmed solar array deployment and a series of mission-payload operations including antenna deployment, AMSR3 initial run-up, and release of the pointing mirror lock for TANSO-3.

On July 20, 2025, IBUKI GW (GOSAT-GW) entered its nominal operational orbit.

From July 14 to July 20, 2025, the TANSO-3 instrument on IBUKI GW (GOSAT-GW) performed its first observations and was confirmed to be operating normally.

On June 30, 2025 at 19:45 JST, JAXA confirmed successful completion of the AMSR3 initial run-up on IBUKI GW (GOSAT-GW) with telemetry received at the Kiruna Station in Sweden.

On June 29, 2025 at 01:33:03 JST, the Global Observing SATellite for Greenhouse gases and Water cycle IBUKI GW (GOSAT-GW) was launched on H-IIA Launch Vehicle No. 50 from Tanegashima Space Center.

As of September 5, 2025, JAXA reported that the AMSR3 antenna on IBUKI GW (GOSAT-GW) was set to rotate at 40 revolutions per minute and that AMSR3 began collecting observation data as part of initial functional verification activities since August 11, 2025.

On June 29, 2025 at 01:51 JST, telemetry received at JAXA Mingenew Station in Australia confirmed full deployment of the solar array paddles on IBUKI GW (GOSAT-GW).

On June 29, 2025 at 02:25 JST, images of IBUKI GW (GOSAT-GW) solar array paddle deployment were received at the Santiago Station in Chile.