Overview
- The MMX spacecraft launched and detached from its H3 upper stage, and is now on a roughly 10‑month cruise to the Martian system.
- The mission will enter orbit near Phobos in about August 2027, deploy the French‑German IDEFIX rover for site scouting in late 2028 or early 2029, and attempt two Phobos touchdowns to collect at least 10 grams of material.
- Sampling will use complementary systems—a Japanese coring sampler and a NASA pneumatic sampler—and at least 15 percent of returned material is reserved for U.S. curation at Johnson Space Center.
- Key risks include the difficulty of landing and operating in Phobos’s extremely weak gravity and scrutiny of the H3 rocket’s reliability, making the launch and separation an important technical milestone for JAXA.
- MMX builds on JAXA’s Hayabusa sample‑return experience, offers a chance to find a tiny fraction of Martian ejecta in Phobos grains, and aims to inform both the moons’ origin and future human missions to the Mars system.