4K Video: The launch of Crew 4 as seen from the press site

A hold-down test-firing of a Falcon 9 rocket Friday at Cape Canaveral marked a major step in preparations for SpaceX’s 13th mission of the year, scheduled for liftoff Monday with a commercial communications satellite.

This will be the 50th Dragon vehicle to visit the International Space Station, including the Dragon 1 vehicles that were berthed to the orbiting lab. Docking with the Harmony module is anticipated Monday, Aug. 25, at 7:30 a.m. EDT (1130 UTC).

Six months after sending one of its communications satellites to orbit on the first re-flight of a SpaceX rocket, SES intends to launch a hybrid television broadcasting satellite owned in partnership with EchoStar on another previously-used Falcon 9 rocket from Florida’s Space Coast as soon as late September, industry officials told Spaceflight Now.