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Progress M-21M (Russian: Прогресс М-21М), identified by NASA as Progress 53P, was a Progress spacecraft used by Roskosmos to resupply the International Space Station (ISS) during 2013.cite-ref-launch-1-0[1] Progress M-21M was built by RKK Energia.

• Launch

• Docking

• Cargo

• Orbit change

• Kurs-NA docking system re-test

• Undocking and reentry

• References

The spacecraft was launched on time at 20:53:06 UTC on 25 November 2013 from the Baikonur Cosmodrome in Kazakhstan.cite-ref-launch-1-1[1]

The Kurs-NA docking system was tested by Progress M-21M during a fly-by of the ISS on 28 November 2013.cite-ref-2[2] Progress M-21M later docked with the ISS on 29 November 2013 at 22:30:20 UTC.cite-ref-3[3]

Progress M-21M delivers goods to the ISS, as fuel components, water, service equipment, equipment for scientific experiments, containers with food, and parcels for the crew. The total mass of all delivered goods is 2398 pounds.

On 13 March 2014, Progress M-21M was used to raise the orbit of the ISS by "two kilometers" after an engine burn of "almost ten minutes".cite-ref-4[4]

Due to problems with the Kurs-NA docking system during the last test in November 2013, another test with the system was successfully done during a two-day free flying period in April 2014. Progress M-21M undocked from the Zvezda module at 08:58 UTC on 23 April 2014 and was guided back to the same docking port two days later, docking at 12:13 UTC on 25 April 2014.cite-ref-5[5]

Progress M-21M undocked from the ISS on 9 June 2014 at 13:29 UTC and was deorbited the same day at 17:23 UTC.

cite-note-launch-11. ↑ Progress M-21M launched to ISS

cite-note-22. ↑ Progress M-21M tested docking system

cite-note-33. ↑ <Progress M-21M docked with the ISS in the manual regime Archived 3 December 2013 at the Wayback Machine

cite-note-44. ↑ Russian Progress Spacecraft Boosts ISS Orbit, space-travel.com, 18 March 2014, accessed 19 March 2014

cite-note-55. ↑ "Russian Space Freighter Completes Tests, Redocks to Zvezda". NASA. Retrieved 16 July 2014.