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Smart Lander for Investigating Moon (SLIM)



The Smart Lander for Investigating Moon (SLIM) is a Japanese Space Agency (JAXA) mission designed to demonstrate accurate lunar landing techniques by a small explorer, with the objective of acceleration of the study of the Moon and planets using lighter exploration systems. The techniques demonstrated by this mission will pave the way for future lunar sample return missions. SLIM is currently under development and scheduled for launch and lunar landing in 2023.

SLIM is an irregularly shaped cuboid 2.4 meters in height, 2.7 meters across, and 1.7 meters deep, with a dry mass of 190 kg. The body is built around the propellant tank as the structural element. Power is provided by thin-film solar cells and a lithium ion battery. SLIM will carry a landing radar for the final descent and a multiband camera for mineralogical exploration of the surface.

SLIM is scheduled to launch as a "ride-share" payload with the XRISM mission on an H2A booster sometime in 2023 from the Tanegashima Space Center in Japan. It will initially go into a 600 x 15 km altitude lunar orbit. It will then enter a powered descent phase to bring it down to 3.5 km altitude. Using the onboard camera, the spacecraft position with respect to the surface is precisely determined. It will them enter the vertical descent phase, lowering towards the surface. At the end of this phase, it will begin its program of obstacle detection, to avoid any hazards at its landing site. At about 3 meters above the surface the engines cut off and the lander drops to the surface. The landed weight will be 210 kg, landing objective is to be within 100 meters of the target point.

Image credit: ISAS/JAXA

Alternate Names

  • SLIM
  • SLIM

Facts in Brief

Launch Date: 
Launch Vehicle: H-2A
Launch Site: Tanegashima, Japan
Mass: 190 kg

Funding Agency

  • Japan Aerospace Exploration Agency (Japan)


  • Planetary Science

Additional Information

Questions and comments about this spacecraft can be directed to: Dr. David R. Williams



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