USERS (Unmanned Space Experiment Recovery System) was a Japanese microgravity experimental satellite. After 8.5 months in orbit, a reentry vehicle was to be returned to earth with the materials manufacturered in space. DRTS (Data Relay & Tracking Satellite) is an inter-satellite communications experiment satellite to relay data between the target spacecraft (low earth orbit satellites, space stations, etc.) and ground stations.

The H-IIA rocket family is an expendable launch system operated by Mitsubishi Heavy Industries for the Japan Aerospace Exploration Agency. The liquid fuelled rocket has been used to launch satellites, lunar spacecraft and planetary science craft.

The Japan Aerospace Exploration Agency (JAXA) is Japan's national aero-space agency. Through the merger of three previously independent organizations, JAXA was formed on 1 October 2003. JAXA is responsible for research, technology development and the launch of satellites into orbit, and is involved in many more advanced missions, such as asteroid exploration and possible manned exploration of the Moon. JAXA launch their Epsilon vehicle from the Uchinoura Space Center and their H-II vehicles from the Tanegashima Space Center.