HTV-X1
 The HTV-X1 cargo spacecraft is pictured in the grips of the Canadarm2 after completing its arrival at the ISS, 29 October 2025 | |
| Mission type | ISS resupply |
|---|---|
| Operator | JAXA |
| COSPAR ID | 2025-241A |
| SATCAT no. | 66174 |
| Website | Official website (in Japanese) |
| Mission duration | 212 days, 14 hours and 8 minutes |
| Spacecraft properties | |
| Spacecraft type | HTV-X |
| Manufacturer | Mitsubishi Heavy Industries |
| Launch mass | ~14,500 kg (32,000 lb) |
| Dimensions | 8.0 × 4.4 m (26.2 × 14.4 ft) |
| Start of mission | |
| Launch date | 26 October 2025, 00:00:15 UTC (09:00:15 JST) |
| Rocket | H3-24W, Flight 7 |
| Launch site | Tanegashima, LA-Y2 |
| Contractor | Mitsubishi Heavy Industries |
| End of mission | |
| Disposal | Deorbited |
| Decay date | 26 May 2026, 14:09 UTC |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Low Earth orbit |
| Inclination | 51.6° |
| Berthing at ISS | |
| Berthing port | Harmony nadir |
| RMS capture | 29 October 2025, 15:58 UTC |
| Berthing date | 30 October 2025, 11:10 UTC |
| Unberthing date | 5 March 2026, 19:26 UTC |
| RMS release | 6 March 2026, 17:00 UTC |
| Time berthed | 126 days, 8 hours and 16 minutes |
| Cargo | |
| Mass | ~4,250 kg (9,370 lb) |
| Pressurised | ~4,000 kg (8,800 lb) |
| Unpressurised | ~250 kg (550 lb) |
 Mission insignia | |
HTV-X1 was the first flight of the HTV-X series, serving as a technical demonstration mission of the new uncrewed expendable cargo spacecraft. It launched on 26 October 2025.