Kounotori 8

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Kounotori 8
Iss020e0413802 - cropped.jpg
H-II Transfer Vehicle (HTV-1) approaching the ISS
Mission typeISS resupply
Spacecraft properties
SpacecraftKounotori 8
Spacecraft typeHTV
Launch mass16,500 kg (36,400 lb)
Payload mass6,000 kg (13,000 lb)
Dimensions9.8 m (32 ft) long x 4.4 m (14 ft) diameter
Start of mission
Launch datePlanned: September 2019
Launch siteLA-Y, Tanegashima
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Berthing at ISS
Berthing portHarmony nadir or Unity nadir
HTV ISS Resupply

Kounotori 8 (こうのとり8号機), also known as HTV-8 will be the 8th flight of the H-II Transfer Vehicle, an unmanned cargo spacecraft to resupply the International Space Station. As of June 2019, it is planned to be launched in September 2019.[1][2][3]


Major changes from previous Kounotori are:[4]

  • 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)


Kounotori 8 carries about 5.4 t of cargo, consisting of 3.5 t in the pressurized compartment and 1.9 t in the unpressurized compartment.[4]

Cargo in the Pressurized Logistics Carrier (PLC) include:[4]

  • 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 [ja]
  • JAXA experiment Hourglass, an experiment to test behavior of pulverulent material under the low-garvity condition
  • 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.[4]


  1. ^ NASA Office of Inspector General (June 28, 2016). NASA's Response to SpaceX's June 2015 Launch Failure: Impacts on Commercial Resupply of the International Space Station (PDF) (Report). NASA Office of Inspector General. p. 13. Retrieved 2016-07-18.
  2. ^ Krebs, Gunter Dirk (2016-07-11). "HTV". space.skyrocket.de. Retrieved 2016-07-18.
  3. ^ "International Space Station Flight Schedule". spider.seds.org. 2019-01-16. Retrieved 2019-02-17.
  4. ^ a b c d 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. 17 July 2019. Retrieved 22 July 2019.

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