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. December 22, 2025 at 01:51 UTC · Launch Failure Why: 2nd stage liquid hydrogen tank pressure abnormally start decreasing after fairing separation, leading up to 2nd stage 1st burn 27 seconds longer than planned & engine shutting down 1 second into 2nd burn. Payload stranded in LEO and re-entered shortly after. H3-22 — Mitsubishi Heavy Industries, to Geosynchronous Transfer Orbit Yoshinobu Launch Complex LP-2, Tanegashima Space Center, Japan The world's 7164th orbital launch attempt, and 315th of 2025. https://www.youtube.com/watch?v=p9WlvRyJaW0 Data: Launch Library 2, The Space Devs. Mission patch: via The Space Devs.