Editing H-II Transfer Vehicle (section)

=== HTV-X ===
{{Main|HTV-X}}
{{Cleanup split|HTV-X|date=August 2022}}
In May 2015, Japan's [[Ministry of Education, Culture, Sports, Science and Technology]] announced a proposal to replace the HTV with an improved, cost-reduced version preliminary called HTV-X.<ref name="mext20150520"/><ref>{{cite web|url=http://www8.cao.go.jp/space/comittee/27-kiban/kiban-dai5/siryou2.pdf|title=国際宇宙ステーション計画を含む有人計画について|language=ja|date=June 3, 2015|access-date=July 13, 2015|url-status=live|archive-url=https://web.archive.org/web/20150713084731/http://www8.cao.go.jp/space/comittee/27-kiban/kiban-dai5/siryou2.pdf|archive-date=July 13, 2015}}</ref>

In December 2015, the plan to develop HTV-X was approved by the Strategic Headquarters for Space Policy of the [[Cabinet Office (Japan)|Cabinet Office]], targeting launch in fiscal year 2021 for the flight of HTV-X1 (Technical Demonstration Vehicle) by the [[H3 (rocket)|H3 rocket]].<ref>{{cite web|url=http://www8.cao.go.jp/space/plan/plan2/kaitei_fy27/kaitei_fy27.pdf|script-title=ja:宇宙基本計画工程表（平成27年度改訂） |language=ja|date=8 December 2015|publisher=Strategic Headquarters for Space Policy|access-date=18 July 2016|url-status=live |archive-url=https://web.archive.org/web/20161020172008/http://www8.cao.go.jp/space/plan/plan2/kaitei_fy27/kaitei_fy27.pdf|archive-date=20 October 2016}}</ref><ref name="jaxa20160714">{{cite web|url=http://www.jaxa.jp/press/2016/07/files/20160714_htv-x_01_j.pdf|script-title=ja:ＨＴＶ‐Ｘの開発状況について|language=ja|date=14 July 2016|author=JAXA|access-date=18 July 2016|url-status=live|archive-url=https://web.archive.org/web/20160715121556/http://www.jaxa.jp/press/2016/07/files/20160714_htv-x_01_j.pdf|archive-date=15 July 2016}}</ref> {{asof|2019|06}}, new ISS plans from NASA's Flight Planning Integration Panel have set the launch of HTV-X1 for February 2022, which is on schedule.<ref>{{cite web|last=Gebhardt|first=Chris |url=https://www.nasaspaceflight.com/2019/06/station-planning-new-crew-launch-dates/|title=Station mission planning reveals new target Commercial Crew launch dates|website=[[NASASpaceFlight.com]]|date=20 June 2019|access-date=20 June 2019|quote=The new HTV is known as HTV-X and is now planned to make its inaugural trip to the Station in February 2022.}}</ref> In 2022 the debut of the HTV-X spacecraft has been furtherly delayed to January 2024.<ref name="berger-20221026">{{cite tweet|number=1585365132116635648|user=SciGuySpace|title=The debut of Japan’s new ISS cargo supply ship, HTV-X, has been delayed from January 2023 to January 2024. It will launch on Japan’s H3 rocket, which also has yet to make its debut.|author=Eric Berger|author-link=Eric Berger (meteorologist)|date=26 October 2022}}</ref>

The HTV-X has a length of 6.2 m, or 10 m with the unpressurised cargo module fitted. The payload fairing adaptor and payload dispenser have been widened from 1.7 m to 4.4 m to allow the pressurized cargo module to be swapped out for alternate modules, to add increased structural strength, and to accommodate the side hatch.<ref name="jaxa20160714"/>

{{As of|2021}}, an evolutionary version of HTV-X called HTV-XG is being considered for transferring cargo to the [[Lunar Gateway]] as part of the [[Artemis program]].<ref>{{cite web |url=https://www.mext.go.jp/kaigisiryo/content/0210630-mxt_uchukai01-000016486_5.pdf |language=Japanese |script-title=ja:アルテミス計画に関する各国の開発状況について |author=JAXA |publisher=Ministry of Education, Cultura, Sports and Technology |date=30 June 2021 |access-date=9 July 2021}}</ref>