- Family: Mu
- Length: 23.6 m
- Diameter: 1.41 m
- Launch Mass: 43 T
- Low Earth Orbit Capacity: 180 kg
The Mu-4S was manufactured by Institute of Space and Astronautical Science with the first launch on 1970-09-25. Mu-4S has 3 successful launches and 1 failed launches with a total of 4 launches. The Mu, also known as M, was a series of Japanese solid-fuelled carrier rockets, which were launched from Uchinoura between 1966 and 2006. Originally developed by Japan’s Institute of Space and Astronautical Science, Mu rockets were later operated by Japan Aerospace Exploration Agency following ISAS becoming part of it.
ISAS is a Japanese national research organization of astrophysics using rockets, astronomical satellites and interplanetary probes which played a major role in Japan's space development. Institute of Space and Astronautical Science is a Government JPN entity that was founded in and is administered by .
Institute of Space and Astronautical Science has 24 successful launches and 8 failed launches with a total of 32 launches.