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HTV 4 was an unmanned, non-reusable cargo spacecraft for delivering pressurized and unpressurized cargo to the International Space Station (ISS). HTV 4 delivered about 5.4 tonnes of supplies to the ISS, including newly developed Freezer-Refrigerator of Stirling Cycle (FROST) and experiment samples to be conducted on the Japanese Experiment Module "Kibo". In addition, HTV 4 delivered unpressurized Orbital Replacement Units (ORUs) in the Unpressurized Logistics Carrier (ULC), which is one of the features of HTV, thus contributing to the maintenance and operation of the ISS.

Among the cargo were also four CubeSats (Pico Dragon, Ardusat 1, Ardusat-X, and TechEdSat 3), to be released from ISS at a future date, and Kirobo, a Japanese experimental robot astronaut.

HTV 4 docked with ISS on 09 August 2013. It undocked from ISS on 04 September 2013. The re-entry trajectory was controlled after release so that re-entry could be observed by ISS passing overhead. Deorbit commands were issued and the spacecraft re-entered the atmosphere on 07 September 2013.

Alternate Names

  • 39221
  • HTV4
  • Kounotori 4

Facts in Brief

Launch Date: 2013-08-03
Launch Vehicle: H-2B
Launch Site: Tanegashima, Japan
Mass: 16500 kg

Funding Agency

  • Japan Aerospace Exploration Agency (Japan)


  • Resupply/Refurbishment/Repair

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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