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H-II Transfer Vehicle KOUNOTORI (HTV)

HTV-1 Mission Logo

HTV-1 Mission Logo

HTV-1 Mission

The HTV-1 Mission is the first flight of the H-II Transfer Vehicle (HTV) that is designed, developed and built in Japan.


HTV Exposed Pallet returned back into HTV Unpressurized Logistics Carrier

HTV Exposed Pallet returned back into HTV Unpressurized Logistics Carrier (September 26, 2009)

The EP was unberthed from Kibo's Exposed Facility (EF) with Kibo's robotic arm (JEMRMS) at 6:07 p.m. September 25. The EP was then handed off to the station's robotic arm (SSRMS) from the JEMRMS, and at 10:20 p.m., the EP was reinstalled into the ULC with the SSRMS.

SMILES and HREP installed on Kibo's Exposed Facility

SMILES and HREP installed on Kibo's Exposed Facility (September 25, 2009)

Transfer and installation of two scientific payloads, SMILES and HREP, on Kibo's Exposed Facility (EF) was completed on Flight Day 15 (FD15).

The HTV Exposed Pallet installed on Kibo's Exposed Facility

The HTV Exposed Pallet installed on Kibo's Exposed Facility (September 24, 2009)

The cargo transfer activities between the HTV Pressurized Logistics Carrier (PLC) and the ISS have moved into full-swing from Flight Day 12 (FD12), September 21. On Flight Day 14 (FD14), September 23, the HTV Exposed Pallet (EP) was installed on Kibo's Exposed Facility (EF).

*All times are Japan Standard Time (JST)

» HTV-1 Mission News

The purpose of HTV-1 Mission

The HTV-1 Mission, HTV’s first flight to the ISS, has two major objectives: one is to deliver supplies to the ISS and the other is to verify HTV's rendezvous flight techniques and operability of the HTV onboard systems during its actual flight. For this reason, this HTV maiden flight vehicle is also called a "Technical Demonstration Vehicle". The HTV-1 Mission will perform the following technical/engineering demonstrations while transporting supplies and cargo to the ISS:

  • Demonstration of HTV’s rendezvous flight operations
  • Verification of HTV’s safety and flight control technology
  • Demonstration of durability and robustness of the HTV structures on orbit
  • Verification of HTV’s avionics and propulsion system components (more than 800,000 parts)
  • Demonstration of astronaut’s ingress to the HTV pressurized section during the docked phase


part of the payload

SMILES loaded to the EP

The HTV-1 Mission will deliver approximately 4.5 tons of cargo to the ISS.

On the HTV-1 Mission, the HTV will carry additional propellants and batteries since demonstration tests are scheduled during the mission. Therefore, the cargo carried on the HTV-1 Mission is less than the standard mass capacity of the HTV.

» Payload


HTV-1 Mission Profile (November 2, 2009) * JST: Japan Standard Time
Mission Details
HTV Flight Number HTV-1 (maiden flight)
Vehicle Technical Demonstration Vehicle
Launch September 11, 2009 2:01 a.m. (JST)
Launch Site Launch Pad 2 (LP2), Tanegashima Space Center (TNSC)
Capture by the SSRMS September 18, 2009 4:51 a.m. (JST)
Berthing to the ISS September 18, 2009 7:27 a.m. (JST)
Unberthing by the SSRMS October 31, 2009 0:02 a.m. (JST)
Separation from the ISS October 31, 2009 2:32 a.m. (JST)
Reentry November 2, 2009 6:26 a.m. approx. (JST)
Mission Duration Approx. 52 days
Altitude Insertion:200 km x 300 km (elliptical orbit)
Rendezvous:Approx. 350 km
Inclination 51.6 degrees
Payload Pressurized
Carrier (PLC)
Supplies for onboard use HTV Resupply Rack (HRR) x 7,
Pressurized Section Resupply Rack (PSRR) x 1
Carrier (ULC)
SMILES (Japanese experiment)
HREP (NASA’s experiment)
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