HTV-X 1, 2, 3 (Kotonotori 1, 2, 3)

HTV-X [JAXA]

JAXA decided in 2015 to devlop an improved, cost-reduced version of the HTV uncrewed non-reusable cargo spacecraft, which is preliminary called HTV-X. Launched by an H-3 rocket, it maneuvers to the vicinity of the ISS, where the Canadarm-2 grapples the HTV-X and berths it to the ISS.

HTV-X re-uses the HTV's Pressurized Logistics Carrier (PLC) as much as possible, except adding a side hatch for late access cargo. The Unpressurized Logistics Carrier, Avionics Module, and Propulsion Module is replaces with a new Service Module. Instead of loading the unpressurized cargo inside the spacecraft, it will be carried on top of the Service Module. The cargo capacity is 4069 kg pressurized cargo and 1750 kg unpressurized cargo for a total of 5820 kg.

Electrical power is provided by deployable mounted solar cells.

At the end of the mission, the HTV-X is unberthed from the ISS by the Canadarm-2 and it is deorbited to a destructive reentry.