Dec. 22, 2025, 1:51 a.m. - Dec. 22, 2025, 2:04 a.m.
QZSS (Quasi Zenith Satellite System) is a Japanese satellite navigation system operating from inclined, elliptical geosynchronous orbits to achieve optimal high-elevation visibility in urban canyons and mountainous areas. The navigation system objective is to broadcast GPS-interoperable and augmentation signals as well as original Japanese (QZSS) signals from a three-spacecraft constellation. The navigation system objective is to broadcast GPS-interoperable and augmentation signals as well as original Japanese (QZSS) signals from a three-spacecraft constellation in inclined, elliptical geosynchronous orbits.
Rescheduled for December 17.
Tweaked launch window.
Tweaked T-0.
Hold at T-13 seconds.
Scrubbed for the day.
The H3 Launch Vehicle is a Japanese expendable launch system. Each H3 booster configuration has a two-digit and a letter designation that indicates the features of that configuration. The first digit represents the number of LE-9 engines on the main stage, either "2" or "3". The second digit indicates the number of SRB-3 solid rocket boosters attached to the base of the rocket, and can be "0", "2" or "4". All layouts of solid boosters are symmetrical. The letter in the end shows the length of the payload fairing, either short "S" or long "L". For example, an H3-24L has two engines, four solid rocket boosters, and a long fairing, whereas an H3-30S has three engines, no solid rocket boosters, and a short fairing.
See DetailsMitsubishi Heavy Industries, Ltd. is a Japanese multinational engineering, electrical equipment and electronics company headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group. MHI's products include aerospace components, air conditioners, aircraft, automotive components, forklift trucks, hydraulic equipment, machine tools, missiles, power generation equipment, printing machines, ships and space launch vehicles. Through its defense-related activities, it is the world's 23rd-largest defense contractor measured by 2011 defense revenues and the largest based in Japan.
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Global launch activity is set to surge over the next week, with 13 missions scheduled… The post Launch Roundup: Ariane 6, Falcon 9, Atlas V, and Electron launches highlight busy week appeared first on NASASpaceFlight.com.
The Dec. 22 launch was the fourth and final flight of an H3 rocket in 2025.
Japan’s flagship H3 rocket suffered an issue with its second stage late Sunday resulting in the loss of the Michibiki 5 (QZS-5) navigation satellite. The post Japan’s H3 suffers second-stage anomaly, QZS-5 satellite lost appeared first on…
An H3 launch failure in December may have been caused by an unusual event that led to the satellite separating from the rocket prematurely. The post H3 failure linked to payload fairing separation anomaly appeared first on SpaceNews.
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Note: Payload identity uncertain. Meridian is a series of communications satellite for military and civilian use.
Details TBD.
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