HTV-X1

HTV-X1 is the first flight and the technical demonstration mission of HTV-X, an uncrewed expendable cargo spacecraft. As of 2024^[update], it is intended to be launched in 2025 to resupply the International Space Station (ISS).^[3]

HTV-X1

Mission type	ISS resupply
Operator	JAXA
Spacecraft properties
Spacecraft	HTV-X1
Spacecraft type	HTV-X
Manufacturer	Mitsubishi Heavy Industries
Start of mission
Launch date	October 2025[1] (planned)
Rocket	H3-24W,[2] Flight 7
Launch site	Tanegashima, LA-Y2
Contractor	Mitsubishi Heavy Industries
Orbital parameters
Reference system	Geocentric orbit
Regime	Low Earth orbit
Berthing at ISS
HTV ISS Resupply ← Kounotori 9 HTV-X2 →

Cargo

In the pressurised compartment, HTV-X1 carries the following cargo:^[4]

• Crew supplies
• DRCS (Demonstration of Removing Carbon-dioxide System)
• NORS (Nitrogen/Oxigen Recharge System) tank
• RST (Water Resupply Tank)

As unpressurised cargo, HTV-X1 carries following cargo:

• i-SEEP, an exposed experiment platform

In addition to the primary mission of carrying the resupply cargo to the ISS, HTV-X1 carries the following payloads:^[2]

• DELIGHT, a technology demonstration of lightweight expandable flat antenna
• Mt.FUJI, a technology demonstration for satellite laser ranging
• H-SSOD, to deploy a CubeSat (Ten-Koh 2) after departure from ISS