H3-24 | HTV-X1
Mitsubishi Heavy Industries
Mission Status
The launch vehicle successfully inserted its payload(s) into the target orbit(s).
Mission Updates
Launch success.
Source →Spacecraft separation.
Source →Official Webcast by JAXA | 宇宙航空研究開発機構 has started
Source →Liftoff.
Source →Official Webcast by JAXA | 宇宙航空研究開発機構 has started
Source →Tweaked T-0.
Source →Rescheduled for October 26.
Source →Launch delayed due to launch site weather, new date TBD.
Source →Tweaked T-0.
Source →Tweaked T-0
Source →Tweaked T-0.
Source →GO for launch.
Source →NET October.
Source →NET September 2025.
Source →Tweaked approximate launch date per launch manifest (P.129 of source).
Source →NET January 2024
Source →Mission Details
First flight of the upgraded Japanese HTV-X spacecraft designed to resupply the International Space Station.
Rocket Configuration
The H3 Launch Vehicle is an expendable launch system in development in Japan. Each H3 booster configuration has a two-digit and a letter designation that indicates the features of that configuration. The first digit represents the number of LE-9 engines on the main stage, either "2" or "3". The second digit indicates the number of SRB-3 solid rocket boosters attached to the base of the rocket, and can be "0", "2" or "4". All layouts of solid boosters are symmetrical. The letter in the end shows the length of the payload fairing, either short "S" or long "L". For example, an H3-24L has two engines, four solid rocket boosters, and a long fairing, whereas an H3-30S has three engines, no solid rocket boosters, and a short fairing.