The LE-5 is a liquid rocket engine developed by ISAS (Institute of Space and Astronautical Science) in Japan. It uses a combination of liquid oxygen and kerosene as propellants, providing a high thrust-to-weight ratio. The engine is designed for use in various space missions, including launching satellites into orbit. This engine is notable for its efficiency and reliability, making it suitable for both orbital and suborbital flights. The LE-5 has been utilized in several launch vehicles, including the H-IIA and H-IIB rockets, contributing to Japan's advancements in space exploration and satellite deployment.