The facts
An H3 rocket lifted off from Tanegashima at 04:41:03 Japan Standard Time on 20 October, equivalent to 19:41:03 UTC on 19 October. JAXA confirmed successful separation and normal initial operation. [1][2]
The mission is expected to reach Mars in 2027. It aims to collect at least 10 grams of material from Phobos and conduct observations of Deimos. [1][2]
Lawrence Livermore National Laboratory’s 28 October account confirms that its gamma-ray spectrometer is aboard. Part of the MEGANE instrument developed with Johns Hopkins APL and NASA, it will help measure surface composition and select sampling sites. [3]
Still unconfirmed
- Whether the mission will successfully land, collect samples and return them remains unknown.
- The mission has not yet produced a Phobos sample-analysis result.
Sources
References support the numbered facts above. Source checks: 29 Oct 2026, 11:28 UTC.
This is catch-up coverage of the launch on its actual Japanese event date, supported by a current mission-partner account. No peer-reviewed discovery or completed sample return is claimed.
- Martian Moons eXploration: launch and mission status
Japan Aerospace Exploration Agency · Primary source
Actual current mission status read. Older prelaunch news links on the same page are not treated as proof of a completed launch.
- Japanese spacecraft begins journey to Mars moon Phobos
Deutsche Welle, with AFP and dpa · Reporting · 20 Oct 2026
Actual public article by Mahima Kapoor read. Independently owned from JAXA; launch confirmation and technical targets rely on the mission team.
- LLNL gamma-ray spectrometer is headed to Martian moon on JAXA’s MMX Project
Lawrence Livermore National Laboratory · Primary source · 28 Oct 2026
Actual mission-partner account read. This confirms its own instrument and the 20 October launch; it is a participant, not independent validation of a future discovery.