Since the first time I saw a reference to MMX - the Martian Moon eXploration - mission, I've been looking forward to this. The vast majority of the time up to now that's just been noting its place in the NextSpaceflight lineup and keeping an eye on it. It has been set on a date that we've been closing in on, and is now scheduled for a launch Monday, US Eastern time. In Japan it's 4:41:03 JST on Oct. 20 - which is 3:41:03 PM EDT / 1941:03 UTC on Monday Oct. 19. Spaceflight Now adds:
An H3 launch vehicle, a rocket developed through a partnership between Mitsubishi Heavy Industries and JAXA (Japan Aerospace Exploration Agency), will launch the Martian Moons eXplorer (MMX) mission to survey the Martian moons, Phobos and Deimos. This is set to be the first sample return mission from the Martian sphere of influence with the samples from Phobos expected to return to Earth in fiscal year 2031. The mission is supported by NASA, CNES, DLR, and ESA.
Next Spaceflight's mission page adds:
A small French rover, built in cooperation with Germany, will also be embarked on the mission and should be able to explore the moon's surface.
To me, the mission is one to watch for a variety of reasons. The obvious first one is that no probe from any nation has ever visited the Martian moons before. Compared to Earth's moon, the Martian moons are tiny so it'll be interesting to see them actually land on Phobos (their target) and maneuver around on the surface to get the mission done. Granted that small probes don't sneeze, but I think if any of us could sneeze on Phobos, it would be enough to reach escape velocity. (Warning: Do Not Try This at Home on Phobos- simply not wearing your space suit would be fatal)
Finally, there's the whole matter of returning the samples gathered by their Rover and compare that to the samples obtained by the Perseverance Rover currently on Mars. When that mission was conceived, the plans were for Percy (the Rover) to pick some interesting samples, store them in titanium tubes ("the size of a large hot dog") onboard the rover and wait for some miracle mission out of nowhere to send a spacecraft to retrieve the samples and then fly them back to Earth. That's an exaggeration, but not a huge one. The bottom line is that NASA gave up on the Sample Return in 2024 after a couple of attempts to come up something they could afford. They had expected to pay $4.4 Billion for a mission to go get those samples, and cancelled when the Requested Proposals were in the range of $8 billion to $11 billion.
NASA's (Science.NASA.gov) web page on this mission goes into details on NASA's contributions to the mission.
“The samples from MMX will bring forth paradigm-shifting science on the Mars system for generations to come, especially as NASA prepares to send the first humans to Mars,” said Nicky Fox, associate administrator, Science Mission Directorate, NASA Headquarters in Washington. ...
NASA’s contributions to the mission include the Mars-moon Exploration with Gamma rays and Neutrons (MEGANE) spectrograph instrument, the Pneumatic Sampler (P-Sampler) technology demonstration, and communications and navigation support from the agency’s Deep Space Network, as well as funding United States scientists participating on the MMX science team.
The MEGANE (pronounced meh-GAH-nay, the Japanese word for eyeglasses) spectrograph will help scientists “see” what Phobos is made of by measuring neutrons and gamma rays emitted from the moon’s surface and determining its chemical elemental composition, which will provide important clues about its origin.
An artist’s concept of JAXA’s MMX spacecraft during its Mars’ orbit insertion.
The Martian moon Phobos, which MMX will explore and sample, is in the
background. Image credit: JAXA
I'm planning and hoping to watch this mission begin on Monday afternoon.
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