Launched in February 2020, the magnetometer on Solar Orbiter has started taking data in April 2020 and immediately observed a stealth coronal mass ejection in situ on 19 April 2020, at 0.8 AU and only 4° away from the Sun-Earth line. In situ measurements by Bepi Colombo and Wind and imaging observations by STEREO-A and SOHO make this a rare triple…