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H-II Transfer Vehicle KOUNOTORI (HTV)


HTV6 mission logo

HTV6 Mission

Developed and built in Japan, the H-II Transfer Vehicle (HTV) known as "KOUNOTORI (white stork)" is an unmanned cargo transfer spacecraft that delivers supplies to the International Space Station (ISS).

With the world’s largest loading capacity of approximately six tons and such unique functions as the International Standard Racks, “KOUNOTORI” plays a key role in ISS operations.

HTV6 payload
HTV6 mission timeline


KOUNOTORI6 Mission Completed

KOUNOTORI6 Mission Completed (February 7, 2017)

KOUNOTORI6 (HTV6) descended to an altitude of 120km over the east coast of New Zealand and reentered the Earth's atmosphere at around 0:06 a.m. on February 6. KOUNOTORI6 successfully completed its cargo supply mission to the ISS.

Reentry of KOUNOTORI6 was confirmed

Reentry of KOUNOTORI6 was confirmed (February 6, 2017)

Reentry of the H-II Transfer Vehicle KOUNOTORI6 (HTV6) into Earth's atmosphere was confirmed.

KOUNOTORI6 performed its third de-orbit maneuver for reentry

KOUNOTORI6 performed its third de-orbit maneuver for reentry (February 5, 2017)

At 11:42 p.m. on February 5, KOUNOTORI6 (HTV6) performed the third de-orbit maneuver for the reentry into the Earth's atmosphere. The HTV6's reentry is scheduled for 0:06 a.m., on February 6.

» HTV6 Mission News

Flight Schedule

HTV6 Mission Schedule (as of February 6, 2017)
All times are Japan Standard Time (UTC + 9 hours)
Item Description
Launch date and time 10:26:47 p.m., December 9 (Friday), 2016
Launch window December 10 - 31, 2016, 2016
Launch site Yoshinobu Launch Complex, Tanegashima Space Center (TNSC)
HTV6 capture 7:39 p.m., December 13, 2016
Berthing completion to the ISS (Activation of the HTV DDCU) 3:24 a.m., December 14, 2016
Departure from the ISS 0:45 a.m., January 28, 2017
Around 0:06 a.m., February 6, 2017
Altitude Insertion Orbit: 200 km x 300 km (elliptical orbit)
Rendezvous: Approx. 400km
Inclination 51.7 degrees
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