H-II Transfer Vehicle (HTV-1) approaching the ISS
|Mission type||ISS resupply|
|Mission duration||23d 7h 12m (in progress)|
|Payload mass||5.3 t (5.2 long tons; 5.8 short tons)|
|Dimensions||9.8 m (32 ft) long × 4.4 m (14 ft) diameter|
|Start of mission|
|Launch date||24 September 2019, 16:05:05 UTC|
|Launch site||LA-Y, Tanegashima|
|Berthing at ISS|
|Berthing port||Harmony nadir|
|RMS capture||28 September 2019, 11:12 UTC|
|Berthing date||28 September 2019, 14:09 UTC|
|Time berthed||19d 9h 8m (in progress)|
Kounotori 8 (こうのとり8号機), also known as HTV-8 is the 8th flight of the H-II Transfer Vehicle, a robotic cargo spacecraft to resupply the International Space Station. It was launched on 24 September 2019, 16:05:05 UTC.
Major changes from previous Kounotori are:
- Replacement of Earth sensor with star tracker for spacecraft attitude control
- New cargo racks developed for HTV-X which allows 30% more Cargo Transfer Bags (CTB) to be carried in the Pressurized Logistics Carrier (PLC). (316 CTBs for Kounotori 8, compared to 248 CTBs of Kounotori 6)
Cargo in the Pressurized Logistics Carrier (PLC) include:
- JAXA experiment Cell Biology Experiment Facility - Left (CBEF-L)
- JAXA experiment Sony Optical Link for ISS (SOLISS), a satellite optical communication demonstration co-developed with Sony Computer Science Laboratories
- JAXA experiment Hourglass, which will investigate the behavior of soil and rock particles under low gravity conditions
- Gas bottle for JAXA experiment
- Experiment materials for Electrostatic Levitation Furnace (ELF)
- CubeSats to be deployed from ISS: NARSSCube-1, AQT-D, RWASAT-1
- NASA system supply cargo: new water tank for Water Storage System (WSS)
- NASA system supply cargo: tank for Nitrogen Oxygen Recharge System (NORS)
In the Unpressurized Logistics Carrier (ULC), Kounotori 8 carries six lithium-ion batteries Orbital Replacement Units (ORUs) for replacing the ISS's existing nickel-hydrogen batteries. The transportation of replacement batteries is a continuation from the previous Kounotori 6 and 7, and will continue through to Kounotori 9.
The H-IIB launch vehicle carrying Kounotori 8 was initially scheduled to be launched at 21:33:29 UTC, 10 September 2019. During launch preparation, a fire broke out at the launch pad at around 18:05 UTC (T minus 3.5 hours), and the launch was called off.
The cause of fire was attributed to the static electricity on the heat resistant material under the mixture of liquid oxygen and gas oxygen for the engine pre-cooling. After the modification to the mobile launch platform to suppress static electricity, a new launch was scheduled at 23 September 2019, 16:30 UTC, but the collision avoidance check revealed that the 2nd stage of the launch vehicle might approach near the Soyuz MS-15 which was scheduled to be launched on 25 September. A revised launch schedule was set at 16:05 UTC, 24 September 2019.
On 24 September 2019, 16:05:05 UTC, the Kounotori 8 aboard H-IIB was launched successfully.
Operation while berthed to the ISS
Kounotori 8 was captured by the Space Station Remote Manipulator System (SSRMS) at 23:13, 27 September 2019, and berthed at Harmony's nadir Common Berthing Mechanism (CBM) by 17:55, 28 September 2019.
The External Palette (EP8), which carries the lithium ion battery Orbital Replacement Units (ORU), was extracted from the Kounotori 8's Unpressurized Logistics Carrier (ULC) by the SSRMS on 29 September 2019.
The External Palette of Kounotori 7 (EP7) was placed in the Kounotori 8's ULC.. EP7 was left on the ISS after the departure of Kounotori 7 due to the schedule change of extravehicular activity after the launch failure of Soyuz MS-10.
- Live coverage: Japanese cargo freighter set for launch to space station
- ISS: Expedition 60
- Japan’s Kounotori Spaceship Attached to Station
- "Launch Result of the H-II Transfer Vehicle KOUNOTORI8 aboard the H-IIB Vehicle No. 8". Mitsubishi Heavy Industries. 25 September 2019. Retrieved 25 September 2019.
- "宇宙ステーション補給機「こうのとり」8号機（HTV8）【ミッションプレスキット】" (PDF) (in Japanese). JAXA. 30 August 2019. Retrieved 3 September 2019.
- "JAXA to launch eighth HTV space station cargo mission in September". Spaceflight Now.
- "Launch Schedule of the H-II Transfer Vehicle KOUNOTORI8 aboard the H-IIB Vehicle No. 8". Mitsubishi Heavy Industries. 29 July 2019. Retrieved 12 September 2019.
- "Launch Time of the H-II Transfer Vehicle KOUNOTORI8 aboard the H-IIB Vehicle No. 8". Mitsubishi Heavy Industries. 9 September 2019. Retrieved 12 September 2019.
- "Launch Canceled, H-II Transfer Vehicle KOUNOTORI8 aboard the H-IIB Vehicle No. 8". Mitsubishi Heavy Industries. 11 September 2019. Retrieved 12 September 2019.
- "Updated Launch Schedule of the H-II Transfer Vehicle KOUNOTORI8 aboard the H-IIB Vehicle No. 8". Mitsubishi Heavy Industries. 20 September 2019. Retrieved 25 September 2019.
- "Updated Launch Schedule of the H-II Transfer Vehicle KOUNOTORI8 aboard the H-IIB Vehicle No. 8". Mitsubishi Heavy Industries. 21 September 2019. Retrieved 25 September 2019.
- 「こうのとり」8号機がSSRMSに把持されました (in Japanese). JAXA. 28 September 2019. Retrieved 3 October 2019.
- 「こうのとり」8号機、ISSとの結合完了！ (in Japanese). JAXA. 29 September 2019. Retrieved 3 October 2019.
- 曝露パレットの収納完了 (in Japanese). JAXA. 1 October 2019. Retrieved 3 October 2019.
- Keeter, Bill (1 October 2019). "ISS Daily Summary Report – 10/01/2019". ISS On-Orbit Status Report. NASA. Retrieved 3 October 2019.
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