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H-II Transfer Vehicle KOUNOTORI (HTV)


HTV4 (Credit: JAXA/NASA)

The H-II Transfer Vehicle (HTV) "KOUNOTORI", developed and built in Japan, is an unmanned cargo transfer spacecraft that delivers supplies to the International Space Station (ISS). Its first, "technical demonstration flight" was launched in September, 2009. HTV is scheduled to launch about once a year to contribute to the ISS operations.

HTV Overview
HTV Components
HTV Operations


ISS batteries loaded into KOUNOTORI6

ISS batteries loaded into KOUNOTORI6 (July 26, 2016)

From June 1-2, the operations for loading the ISS battery Orbital Replacement Units (ORUs) into the H-II Transfer Vehicle KOUNOTORI6 and filling the water bags were unveiled to the press at the Tanegashima Space Center (TNSC).

KOUNOTORI5 Mission Completed

KOUNOTORI5 Mission Completed (September 30, 2015)

KOUNOTORI5 (HTV5) reentered Earth's atmosphere at 5:33 a.m., September 30 (8:33 p.m., September 29 UTC).


KOUNOTORI5 Leaves the ISS (September 29, 2015)

KOUNOTORI5 (HTV5) was unberthed from the nadir port of Harmony (node 2) by the Space Station Remote Manipulator System (SSRMS) at 8:12 p.m., September 28 (11:12 a.m., September 28 UTC).

*All times are Japan Standard Time (JST)

≫ HTV News

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