JAXA/ISAS's TANSEI-4 (MS-T4) was an engineering-test mission launched on 1980-02-17 aboard M-3S-1 from Uchinoura. It verified the M-3S vehicle and tested magnetic and flywheel attitude control, solar-array deployment, telemetry, tracking, and related technologies for later scientific satellites until operations ended on 1983-05-13.
Alerts are unavailable because this mission is no longer active.