Progress M-23M (Russian: Прогресс М-23М), identified by NASA as Progress 55P, is a Progress spacecraft used by Roskosmos to resupply the International Space Station (ISS) during 2014.[2] Progress M-23M was launched on a six-hours rendezvous profile towards the ISS. The 23rd Progress-M 11F615A60 spacecraft to be launched, it had the serial number 423 and was built by RKK Energia.
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).