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Japanese two-stage rocket that is modified to carry a 3rd stage. It aims to send 140kg payload in a 800km orbit. It measures 10 in height and 50cm in diameter.

- First stage: based on S-520
- Second stage:
- Third stage:

SS-520 launches

# Launch id Payload Launch Date Site Type Status/Comment (orbit in perigee x apogee x inclination)
1 n/a Tricom 1 14 Jan 2017   failure
2 18016 Tricom 1R 3 Feb 2018 at 05:03 UT 3 stage 186 x 2012 km x 30.9°
Notes: in the launch site column U stands for Uchinouora.

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