Night time view of Progress M-23M docked at the ISS
|Mission type||ISS resupply|
|Spacecraft type||Progress-M 11F615A60|
|Start of mission|
|Launch date||9 April 2014, 15:26:27UTC|
|Launch site||Baikonur 1/5|
|End of mission|
|Decay date||31 July 2014, 22:42UTC|
|Docking with ISS|
|Docking port||Pirs nadir|
|Docking date||9 April 2014, 21:14 UTC|
|Undocking date||21 July 2014, 21:44 UTC|
|Time docked||103 days, 0 hours, 30 minutes|
Progress M-23M (Russian: Прогресс М-23М), identified by NASA as Progress 55 or 55P, is a Progress spacecraft used by Roskosmos to resupply the International Space Station (ISS) during 2014. Progress M-23M was launched on a 6-hours rendezvous profile towards the ISS. The 23rd Progress-M 11F615A60 spacecraft to be launched, it had the serial number 427 and was built by RKK Energia.
Progress M-23M docked with the Pirs docking compartment on April 9, 2014 at 21:14 GMT, less than six hours after launch.
The Progress spacecraft carries 2383 kg of cargo and supplies to the International Space Station. 
Undocking and Reentry
Progress M-23M undocked from the ISS on 21 July 2014, and was de-orbited on 31 July after participating in the Radar-Progress experiment.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 10 April 2014.
- Chris Bergin (April 9, 2014). "Progress M-23M docks with ISS following fast track launch". NASASpaceflight.com.
- Stephen Clark (9 April 2014). "Russian Progress cargo craft docks at space station". Spaceflight Now.
- "Progress M-23M". Roscosmos. 10 April 2014.
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