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H-II Transfer Vehicle KOUNOTORI (HTV)

HTV9 Mission Timeline

Last Updated: May 1, 2020


Flight Day	Major mission events
FD1		Launch, Orbit Insertion Post-insertion auto sequence HTV subsystem activations Attitude control Anomaly check Establishment of communication with the Tracking and Data Relay Satellite (TDRS) Initiation of communication with the HTV Mission Control Room (HTV MCR) at the Tsukuba Space Center Initiation of Rendezvous Maneuver
FD1 to FD4		Rendezvous Maneuver to the ISS
FD4		Proximity Operations, Final Approach Streaming live video from HTV to ISS via wireless LAN communication / Wireless LAN Demonstration (WLD) Capture by the Space Station Remote Manipulator System (SSRMS) Berthing to the ISS Berthing to the Common Berthing Mechanism (CBM) on the Harmony's Nadir Port Vestibule outfitting (connection of power and communication line) Switching of the communications line (Radio wave to fixed line)
-		Crew ingress to the Pressurized Logistics Carrier (PLC) Hatch open Activation of the Inter-Module Ventilation (IMV)
-		Cargo Transfer from the PLC to the ISS
-		Removal of the Exposed Pallet (EP) from the HTV's Unpressurized Logistics Carrier (ULC), and transfer to the ISS truss using the SSRMS/Mobaile Transporter (MT)
-		Transfer of the ISS battery ORUs assembled Japanese lithium-ion battery cells^※ out of the EP using Special Purpose Dexterous Manipulator (SPDM) ^※The old nickel hydride batteries are replaced by the new lithium-ion batteries which are continuously delivered by HTV6 to HTV9.
-		Reinstallation of the EP back into the HTV's ULC
-		Cargo transfer / Trash loading
A day before departure from the ISS		Preparation for the HTV departure from the ISS IMV de-activation Hatch closure Switching of the communications line (Fixed line to radio wave)
Departure from the ISS		HTV departure from the ISS Deactivation of HTV power supply from ISS Disconnection of power and communication line HTV grapple by the SSRMS CBM bolts release SSRMS moves HTV to the release position Activation of the Guidance Navigation Control (GNC), activation of HTV propulsion system SSRMS releases HTV HTV departs from the ISS
Reentry		Fiery Reentry

^※ In-flight schedule of the HTV mission is subject to change depending on the ISS's operational timeline.
^※ Photos used in the table were taken during the previous HTV missions.

*All times are Japan Standard Time (JST. UTC + 9 hours)

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