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A Progress freighter, launched yesterday, will not dock with ISS for four days in order to test upgrades to its rendezvou radar system.
Unlike recent Progress vehicles that used the 2AO-VKA and AKR-VKA antennas of Kurs-A system, M-21M is sporting a AO-753A antenna of the Kurs-NA system instead. Once the Progress reaches its preliminary orbit, it will conduct a series of automated engine burns to put it on track to fly within one mile of the station on Wednesday, allowing for the test of the lighter, more-efficient Kurs automated rendezvous system hardware for upgraded Soyuz and Progress vehicles.
After it finishes its flyby, the Progress will loop above and behind the station, returning Friday for a docking.