Japan’s H3 rocket loses 5-ton Michibiki 5 satellite after payload fairing separation

Japan’s eighth H3 rocket failed after its payload fairing separated, causing the roughly 5-ton Michibiki 5 navigation satellite to be lost in Pacific debris; telemetry hints at a LH2 tank pressure drop and possible damage to the satellite mounting, with investigators considering a fairing–satellite impact or residual stress as potential causes. The second stage briefly placed the vehicle in a low-altitude orbit before reentry hours later, and Japan’s MMX mission launch remains awaiting a full investigation before proceeding.