MetOp-SG B1 is a future European weather satellite, the first of the microwave imaging-focused B-type of the MetOp-SG series. It carries five instruments: a scatterometer for observing ocean-surface wind and soil moisture (SCA), a radio occultation sounder to measure atmospheric temperature and humidity (RO), a microwave imager to monitor precipitation and sea-ice extent (MWI), an ice cloud imager to measure water in clouds (ICI), and an Argos-4 data collection system (A-DCS). Its single solar panel wing is 11 m long with surface of 24 square meters and consists of four segments. The satellite is expected to launch in October 2026 on Ariane 62 as the second satellite of the MetOp-SG series after MetOp-SG A1/Sentinel-5A launched in August 2025.