Oceansat-3

Oceansat-3 (EOS-06) is ISRO's third ocean-colour satellite, launched on 26 November 2022 aboard PSLV-C54 into a sun-synchronous polar orbit at 723 km.^[1][2] The mission carries four payloads: the Ocean Colour Monitor OCM-3, the Sea Surface Temperature Monitor SSTM, the Ku-band scatterometer OSCAT-3, and an Argos-4 data-collection transponder. OCM-3 provides global ocean-colour and water-leaving radiance data, while OSCAT-3 delivers ocean surface wind vectors at 25 km resolution with a 1,800 km swath and approximately two-day repeat coverage.^[3] SSTM was designed to measure sea surface temperature but experienced a scan mechanism failure in orbit; the ISRO mission page records the overall satellite as operational while WMO OSCAR flags the SSTM instrument failure, resulting in a degraded mission classification.^[3] OCM-3 and OSCAT-3 remain operational, continuing the Oceansat programme's global ocean-monitoring heritage in support of ocean-colour retrieval, marine primary production assessment, sea surface temperature estimation, and coastal water quality studies.^[4]