Launches & rockets · first seen 13 Sep, updated 13 Sep
Live coverage: SpaceX to launch final 3 O3b mPOWER satellites for SES
The launch marks the 400th orbital flight from Space Launch Complex 40 at Cape Canaveral Space Force Station. Liftoff is scheduled during an 87-minute window that opens at 2:49 p.m. EDT (1849 UTC).
Summary from Spaceflight Now.