OMOTENASHI is a CubeSat that will be launched by NASA SLS rocket. Its mission is to demonstrate that a CubeSat can make a semi-hard landing on the Moon. The 6U-size spacecraft, which weighs 12.6kg, and consists of an orbiting module (OM), a rocket motor (RM) for deceleration on approach to the moon, and a surface probe (SP) as the landing module. Under tight resource constraints, a unique structure and separation mechanism is designed for a small space and a low mass. A validity of these designs has been verified through a vibration test. The margin of safety under the launch vibration is calculated by the structure analysis. In addition, to increase the impact resistance, all components of SP are filled with an epoxy resin. This performance had been evaluated by the drop impact test. As the result, this test model endured more than 16,158G with no function failure. In this paper, the design overview and test results are described.
