HTV-X1

{{Short description|Planned Japanese resupply spaceflight to the ISS}}

{{refimprove|date=March 2021}}

{{Infobox spaceflight

| name = HTV-X1

| names_list =

| image =

| image_caption =

| image_alt =

| image_size =

| image_upright =

| mission_type = ISS resupply

| operator = JAXA

| Harvard_designation =

| COSPAR_ID =

| SATCAT =

| website =

| mission_duration =

| distance_travelled =

| orbits_completed =

| suborbital_range =

| suborbital_apogee =

| spacecraft = HTV-X1

| spacecraft_type = HTV-X

| spacecraft_bus =

| manufacturer = MHI

| launch_mass =

| BOL_mass =

| landing_mass =

| dry_mass =

| payload_mass =

| dimensions =

| power =

|space_station =

|start_date =

|end_date =

|arrival_craft =

|departure_craft =

| crew_size =

| crew_members =

| crew_launching =

| crew_landing =

| crew_callsign =

| crew_expedition =

| crew_EVAs =

| crew_EVA_duration =

| crew_photo =

| crew_photo_alt =

| crew_photo_caption =

| crew_photo_size =

| crew_photo_upright =

| launch_date = October 2025{{Cite web |title=HTV-X1 |url=https://nextspaceflight.com/launches/details/2552 |access-date=2024-10-26 |website=Next Spaceflight |language=en}} (planned)

| launch_rocket = H3-24WF7

| launch_site = Tanegashima LA-Y2

| launch_contractor = MHI

| deployment_from =

| deployment_date =

| entered_service =

| disposal_type =

| declared =

| deactivated =

| destroyed =

| last_contact =

| recovery_by =

| recovery_date =

| decay_date =

| landing_date =

| landing_site =

| orbit_reference =

| orbit_regime =

| orbit_longitude =

| orbit_slot =

| orbit_semimajor =

| orbit_eccentricity =

| orbit_altitude =

| orbit_periapsis =

| orbit_apoapsis =

| orbit_inclination =

| orbit_period =

| orbit_RAAN =

| orbit_arg_periapsis =

| orbit_mean_anomaly =

| orbit_mean_motion =

| orbit_repeat =

| orbit_velocity =

| orbit_epoch =

| orbit_rev_number =

| apsis =

| docking =

{{Infobox spaceflight/Dock

| docking_target = ISS

| docking_type = berth

| type_override = berth

| docking_port =

| docking_date =

| undocking_date =

| capture_date =

| release_date =

| time_docked =

}}

| payload_items =

| cargo_mass =

| cargo_mass_press =

| cargo_mass_unpress =

| cargo_mass_fuel =

| cargo_mass_gas =

| cargo_mass_water =

| instrument_type =

| telescope_name =

| telescope_type =

| telescope_diameter =

| telescope_focal_length=

| telescope_area =

| telescope_wavelength =

| telescope_resolution =

| instruments =

| trans_band =

| trans_frequency =

| trans_bandwidth =

| trans_capacity =

| trans_coverage =

| trans_TWTA =

| trans_EIRP =

| trans_HPBW =

| programme = HTV ISS Resupply

| previous_mission = Kounotori 9

| next_mission = HTV-X2

| programme2 =

| previous_mission2 =

| next_mission2 =

| insignia =

| insignia_caption =

| insignia_alt =

| insignia_size =

| insignia_upright =

}}

HTV-X1 is the first flight and the technical demonstration mission of HTV-X, an uncrewed expendable cargo spacecraft. {{As of|2024}}, it is intended to be launched in 2025 to resupply the International Space Station (ISS).{{cite web |url=https://www8.cao.go.jp/space/plan/plan2/kaitei_fy05/kaitei_fy0512.pdf |title=宇宙基本計画⼯程表 (令和５年度改訂) |trans-title=Basic Plan on Space Policy (2023 Revision) |page=45 |publisher=Cabinet Office |date=22 December 2023 |access-date=26 December 2023 |language=ja |archive-date=25 December 2023 |archive-url=https://web.archive.org/web/20231225105156/https://www8.cao.go.jp/space/plan/plan2/kaitei_fy05/kaitei_fy0512.pdf |url-status=live}}