Japan

JAXA •

SLIM is the Japan Aerospace Exploration Agency's small-class lunar lander demonstration developed by the Institute of Space and Astronautical Science (ISAS) and built under prime contract by Mitsubishi Electric, with a stated objective to demonstrate sub-100-metre landing accuracy — orders of magnitude better than the historic kilometre-class precision typical of pre-2024 lunar landers [1]. The spacecraft was launched on an H-IIA Flight 47 from Tanegashima Space Center on September 6, 2023 alongside the XRISM X-ray observatory, executed a four-month low-energy lunar transfer, and successfully soft-landed near the Shioli crater on the lunar near side at 00:20 JST on January 20, 2024 (January 19, 2024 UTC) [2]. JAXA confirmed in a January 25, 2024 press conference that SLIM achieved its pinpoint-landing objective with a touchdown approximately 55 metres east of its targeted point — a world-first for any lunar lander — but had landed in a nose-down attitude after one of the two main engines failed during the final descent, leaving the spacecraft tilted with its solar panels facing away from optimal Sun angles [2][6]. SLIM nevertheless powered up on January 28, 2024 when solar illumination shifted, completed multispectral imaging campaigns with its LEV-1 hopping micro-rover and LEV-2 (SORA-Q) palm-sized rover developed with Takara Tomy and Sony, and survived three lunar nights before contact was lost — well beyond the original mission baseline [2][6]. The mission total cost has been reported at approximately ¥18B (~$120M) including spacecraft, payloads and launch vehicle share [3]. JAXA's broader lunar architecture extends beyond SLIM into three programmes: (1) the Lunar Polar Exploration mission (LUPEX), executed jointly with ISRO, providing the rover and an H3 launcher with ISRO providing the lander, targeting the late-2020s window [7]; (2) the Lunar Cruiser pressurised rover for NASA's Artemis programme, developed in collaboration with Toyota Motor Corporation and JAXA under a January 2024 Memorandum of Understanding with NASA, targeting deployment to the lunar surface in 2031 [4]; (3) participation in the Artemis Accords (Japan signed October 13, 2020) and commitment to deliver Japanese astronauts to the lunar surface aboard Artemis missions [4][5]. The Japanese commercial sector now also operates lunar landers — ispace's HAKUTO-R Mission 1 lander reached lunar orbit but crashed during descent in April 2023 and a Mission 2 lander (Resilience) is currently en route — providing a complementary commercial pillar to JAXA's flagship architecture [8].

JAXA •

The H3 launch vehicle is the next-generation Japanese flagship expendable rocket developed jointly by JAXA and Mitsubishi Heavy Industries (MHI) under a fixed-price contract intended to halve per-launch costs versus the previous-generation H-IIA while doubling its payload capability [1][2]. The vehicle's core architecture is a two-stage liquid hydrogen / liquid oxygen design powered by the new LE-9 first-stage engine — a high-thrust, expander-bleed-cycle LH2/LOX engine developed by JAXA and MHI, generating approximately 1,471 kN at sea level — and the LE-5B-3 second-stage engine derived from H-IIA heritage [1]. The vehicle is offered in multiple configurations distinguished by the number of LE-9 engines (2 or 3), the number of solid rocket boosters (0, 2 or 4 SRB-3 strap-ons supplied by IHI Aerospace), and the payload fairing length; the H3-24L configuration with two LE-9s, four SRBs and a long fairing is the high-capability variant baselined for GTO commercial missions and JAXA flagship deep-space programmes [1]. Total H3 development cost was disclosed by JAXA at approximately ¥190B (~$1.3B) through first flight [6]. The Test Flight 1 (TF1) launch on March 7, 2023 from Tanegashima Space Center carrying the ALOS-3 Earth observation satellite failed when the LE-5B-3 second stage failed to ignite; flight termination commanded by ground controllers resulted in the loss of the vehicle and payload — a high-profile setback widely reported in international trade press [3][7]. Subsequent failure-investigation reports identified an electrical anomaly in the second-stage ignition sequence and triggered redesign of the affected harness; remedial actions were qualified for Test Flight 2 (TF2), which successfully launched on February 17, 2024 with two CubeSat secondary payloads and a mass-simulator main payload [4]. H3 then transitioned to operational missions: H3 Flight 3 launched ALOS-4 in July 2024, Flight 4 launched the Kirameki-3 X-band defence communications satellite, and the first commercial mission carrying Inmarsat-6 F2 launched in late 2024 [5][8]. The vehicle is intended to fly at a target cadence of approximately 6 launches per year by the late 2020s, with applications including the LUPEX (Chandrayaan-5) joint ISRO-JAXA polar lunar mission, MMX Mars moons sample return, and continued operational satellite deliveries [9].

JAXA + ISRO •

The Lunar Polar Exploration Mission (LUPEX, 月極域探査機; also publicly referenced as Chandrayaan-5 in ISRO planning) is a joint mission between the Japan Aerospace Exploration Agency (JAXA) and the Indian Space Research Organisation (ISRO), formally agreed in 2017 and progressively de-scoped, re-baselined and reaffirmed across multiple JAXA-ISRO joint working group meetings through 2024-2026 [1][2]. Under the current architecture, JAXA leads the integrated mission and provides the H3 launch vehicle (operating from Tanegashima Space Center) plus the rover element — a ~350 kg pressurised, six-wheeled mobile platform with a ~100-day surface-life design and a drilling system capable of obtaining sub-surface samples down to ~1.5 m [3][4]. ISRO provides the lander platform — leveraging the Chandrayaan-3 Vikram lineage with extensions for the heavier rover payload and the additional polar-thermal-survival requirements — and carries Indian payloads including a near-infrared spectrometer and a permanently-shadowed-region thermal imager [2][4]. The combined stack targets the southern polar region (candidate landing zones near Shackleton, Haworth and Faustini craters) and will deploy the rover into permanently shadowed crater interiors for the first sustained mobile science campaign in lunar PSRs — a capability complementary to NASA's cancelled VIPER and to CNSA's Chang'e 7 'mini flying detector' [3][7]. JAXA's published mission cost envelope is approximately ¥40 billion (~$270M) on the Japanese side [6], while the Indian Cabinet's specific LUPEX cost-share remains under negotiation as of mid-2026 and has not been formally disclosed at the line-item level beyond the broader Department of Space FY2025-26 envelope of Rs 13,416 crore (~$1.6B) [9]. Launch is currently targeted no earlier than 2026-2027, with multiple JAXA / ISRO public statements indicating slip risk into 2028 [2][8]. LUPEX builds on Japan's SLIM (Smart Lander for Investigating Moon) success in January 2024 — which made Japan the fifth nation to soft-land on the Moon — and the operational Chandrayaan-2 orbiter providing south-polar terrain reconnaissance [5].

JAXA • 2023–2030

Japan became the 5th country to soft-land on the Moon with SLIM (Smart Lander for Investigating Moon) on Jan 19, 2024. Though it landed upside-down, it demonstrated pinpoint landing accuracy (within 55m of target). JAXA is now developing LUPEX (Lunar Polar Exploration) with ISRO for south pole water ice investigation, and contributing to Gateway and Artemis.

JAXA / Mitsubishi Heavy Industries • 2014–ongoing

Japan's next-generation flagship rocket replacing H-IIA. After a failed first flight in Mar 2023 (second stage shutdown), H3 successfully reached orbit on its second attempt in Feb 2024. Now operational, targeting 50% cost reduction over H-IIA. Key for Japan's independent access to space and launching IGS reconnaissance satellites.

JAXA / ISRO • 2028–2029

Joint Japan-India lunar rover mission to the Moon's south pole. JAXA provides the rover and ISRO provides the lander. The rover will carry a drill capable of penetrating 1.5 meters below the surface to confirm the presence of water ice and characterize its distribution. Toyota is developing the rover's driving technology.