The other object is actually the USAF weather sat Defense Meteorological Satellite Program (DMSP) Block 5D F-3 satellite, aka DMSP 14537. The DMSP sats were similar to the NOAA POES civilian weather sats. Its mass was 519 kg. pic.twitter.com/PsWCX9Y6H5

— Jonathan McDowell (@planet4589) April 8, 2021