H3-24

H3 with four solid boosters, flown in October 2025 to launch HTV-X1, the first of Japan's new cargo ships for the International Space Station.

Launches

1

Success rate

100%

0 failures

First flight

26 October 2025

HTV-X1

Builder

MHI

Height

63 m

Diameter

5.3 m

Stages

2

Boosters

4 × H3 SRB-3

Propellants

Solid, LH2 / LOX

Payload to LEO

19,750 kg

Payload to GTO

7,900 kg