Japan Aerospace Exploration AgencyH-IIA 202Yoshinobu Launch Complex LP-1, Tanegashima Space Center, Japan

GOSAT-GW (Ibuki GW)

Name: GOSAT-GW (Ibuki GW) launch
Start: 2025-06-28T16:33:03.000Z
End: 2025-06-28T16:52:00.000Z
Location: Yoshinobu Launch Complex LP-1, Tanegashima Space Center, Japan

Launched

June 28, 2025 · 16:33 UTC

Launch Successful

Image: Mitsubishi Heavy Industries

Summary

GOSAT-GW (Ibuki GW) launched on a Japan Aerospace Exploration Agency H-IIA 202 from Yoshinobu Launch Complex LP-1, Tanegashima Space Center, Japan on June 28, 2025 at 16:33 UTC. The launch window ran from 16:33 to 16:52 UTC. It was Japan Aerospace Exploration Agency's 37th launch, 1st this year and humanity's 6,994th orbital launch attempt. It was the 35th H-IIA 202 flight and the 1st this year. The payload was bound for Sun-Synchronous Orbit (SSO). Ibuki-GW, one of 2 catalogued objects, reached a 673 × 675 km orbit inclined 98.1°. 2 objects from this launch are catalogued, one of them a payload.

Watch: Launch of “IBUKI GW”(GOSAT-GW) aboard H-IIA Launch Vehicle No.50JAXA | 宇宙航空研究開発機構
温室効果ガス・水循環観測技術衛星（GOSAT-GW）／H-IIAロケット50号機打上げライブ中継JAXA | 宇宙航空研究開発機構
Vehicle: H-IIA 202 · Japan Aerospace Exploration Agency
Booster: No booster details on record.
Mission: Earth Science · Sun-Synchronous Orbit (SSO)for JAXA
Milestone: 35th H-IIA 202 flight · 1st this yearJapan Aerospace Exploration Agency's 37th launch1st this yearhumanity's 6,994th orbital launch attempt145th orbital launch attempt this year

Webcast

Replay

Watch on YouTube

Flight preview

Orbit: as tracked

98.1°Inclination

673 × 675 kmPerigee × apogeefrom mean elements

98.1 minPeriodfrom mean elements

118.5°Ascending node

474 d agoElement epoch2025-06-28 18:00 UTC · stale

Ibuki-GW · NORAD 64694 · 2025-141 · Space-Track · tracking 1 of 2 objects

Show the numbers

Object: TBA - TO BE ASSIGNED
Object ID: 2025-140A
Epoch: 2025-06-28 18:00:48 UTC
Mean motion: 14.68092379 rev/day
Eccentricity: 0.0001554
Inclination: 98.055°
Ascending node: 118.4627°
Arg. of perigee: 94.5777°
Mean anomaly: 344.332°
Element set: 999
Rev at epoch: 0
B*: 0

Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: SSO. Ascent drawn from padside's representative profile.

Catalogued objects

2 catalogued: 1 payload, 1 rocket stage; 2 still in orbit

Ibuki-GW · NORAD 64694 · in orbit

H-2A F50 Stage 2 · in orbit

Data from J. McDowell, planet4589.org

About this launch

GOSAT-GW (Greenhouse Gases Observing Satellite Greenhouse gases and Water cycle), also known as Ibuki GW and formerly known as GOSAT 3, is JAXA's next generation satellite to monitor the greenhosue gases like carbon dioxide in the Earth's atmosphere. It is the follow on to the GOSAT 2 (Ibuki 2) and GCOM-W (Shizuku) missions. GOSAT-GW will have two missions: greenhouse gases observation for Japan's Ministry of the Environment and the National Institute for Environmental Studies (NIES), and water-cycle observation for JAXA. By developing the GOSAT-GW satellite, Mitsubishi Electric will contribute to measures for preventing disasters attributed to global warming and climate change, and to advance scientific and technological methods that enable more accurate prediction of climate change. In December 2013, Mitsubishi Electric (MELCO) was selected as the prime contractor for the spacecraft and the instruments.

Pad

Yoshinobu Launch Complex LP-1, Tanegashima Space Center, Japan

57th launch from Yoshinobu Launch Complex LP-1, 1st this year · 95th from Tanegashima Space Center, Japan

Local pad time at liftoff: Jun 29, 1:33 AM GMT+9, at night

57 launches from this pad · 99 from Tanegashima Space Center, Japan

275 days after the previous launch from this pad

All launches from Tanegashima Space Center, Japan Open in maps

Updates

Launch success.

Cosmic_Penguin · Jun 28, 2025 · source

Show 9 earlier updates

Spacecraft separation.
Cosmic_Penguin · 6/28/2025 · source
Liftoff.
Cosmic_Penguin · 6/28/2025 · source
Rescheduled for June 28 UTC.
Cosmic_Penguin · 6/24/2025 · source
Launch delayed due to 2nd stage electrical system problem; new launch date TBD.
Cosmic_Penguin · 6/19/2025 · source
GO for launch.
Cosmic_Penguin · 4/25/2025 · source
NET June 23 UTC/early morning June 24 JST.
Cosmic_Penguin · 4/23/2025 · source
NET June 2025.
Cosmic_Penguin · 3/18/2025 · source
NET Q2 due to satellite testing delays.
Cosmic_Penguin · 12/9/2024 · source
Tweaked approximate launch date per launch manifest (P.129 of source).
Cosmic_Penguin · 1/9/2024 · source

Questions

When did GOSAT-GW (Ibuki GW) launch?

GOSAT-GW (Ibuki GW) launched on June 28, 2025 at 16:33 UTC. The launch window ran from 16:33 to 16:52 UTC.

Where can I watch GOSAT-GW (Ibuki GW)?

Coverage: Launch of “IBUKI GW”(GOSAT-GW) aboard H-IIA Launch Vehicle No.50; 温室効果ガス・水循環観測技術衛星（GOSAT-GW）／H-IIAロケット50号機打上げライブ中継. Watch the replay

What rocket launched GOSAT-GW (Ibuki GW)?

H-IIA 202, flown by Japan Aerospace Exploration Agency. H-IIA 202 spec sheet

Where did GOSAT-GW (Ibuki GW) launch from?

Yoshinobu Launch Complex LP-1, Tanegashima Space Center, Japan. Liftoff was Jun 29, 1:33 AM GMT+9 local time at the pad.

What orbit did GOSAT-GW (Ibuki GW) reach?

Ibuki-GW, one of 2 catalogued objects, reached a 673 × 675 km orbit inclined 98.1°.

How many satellites did GOSAT-GW (Ibuki GW) launch?

1 payload from this launch is catalogued, still in orbit (Data from J. McDowell, planet4589.org).