Spaceflight Insider

New Kounotori 7 launch date announced by JAXA

A file photo of the previous H-IIB rocket to send a Kounotori spacecraft into orbit. Photo Credit: JAXA

A file photo of the previous H-IIB rocket to send a Kounotori spacecraft into orbit. Photo Credit: JAXA

The Japan Aerospace Exploration Agency (JAXA), together with Mitsubishi Heavy Industries, Ltd. (MHI), announced a new launch date for Japan’s Kounotori 7 cargo flight to the International Space Station.

According to the latest press release issued by JAXA, the Kounotori 7 mission (also known as HTV-7), will lift off at 2:15 p.m. EDT Sept. 21 (18:15 GMT Sept. 21/ 3:15 local time Sept. 22), 2018. The cargo craft will launch atop an H-IIB rocket from Tanegashima Space Center in southern Japan.

HTV-7 was initially scheduled to launch at 6:32 p.m. EDT Sept. 10 (22:32 GMT Sept. 10 / 7:32 a.m. local time Sept. 11). However, unfavorable weather conditions, including strong winds caused by a typhoon near Guam, forced JAXA to postpone the mission several days. Guam is home to the main ground tracking station necessary to maintain communications between flight controllers and H-IIB/HTV-7.

After careful examination of the weather, the launch was rescheduled to 4:59 p.m. EDT Sept. 14 (20:59 GMT Sept. 14 / 5:59 a.m. local time Sept. 15), but this time the liftoff was scrubbed about two hours before ignition of H-IIB’s engines. The launch was halted due to an issue with the rocket’s propulsion system and required a postponement of about a week to allow time for engineers to identify and solve the problem.

“MHI and JAXA have taken the course of action necessary to identify and deal with the cause that the investigation revealed. The corrective measures which ensued from the investigation have completed,” JAXA wrote in a press release.

Given that the launch was postponed by a week, the HTV-7 spacecraft should arrive at ISS on Tuesday, Sept. 25. Its capture by the station’s robotic Canadarm2 is now expected at around 8:00 a.m. EDT (12:00 GMT).

As was the case with the previous delay, the new launch date and the exact liftoff time are subject to change. They are dependent on weather forecasts, ISS operations and the station’s current orbit. The reserve launch window is still open until Oct. 31, 2018.

Built by MHI, the 23,100-pound (10,500-kilogram) vessel is loaded with about 6.2 metric tons of supplies, fresh food, water, spare parts and experiments. The cargo aboard HTV-7 includes six new lithium-ion batteries for the station.

Given that two spacewalks were initially planned for Sept. 20 and Sept. 26 with a primary task to replace the old nickel-hydrogen batteries with the new lithium-ion units, new dates for these extravehicular activities should be announced soon.




Tomasz Nowakowski is the owner of Astro Watch, one of the premier astronomy and science-related blogs on the internet. Nowakowski reached out to SpaceFlight Insider in an effort to have the two space-related websites collaborate. Nowakowski's generous offer was gratefully received with the two organizations now working to better relay important developments as they pertain to space exploration.

Reader Comments

Hopefully, Serena gets to do the second EVA with Gerst.

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