SpaceX launched a new Falcon 9 v1.2 on a resupply mission to the ISS on Aug 14, 2017 from KSC Pad 39A carrying the Dragon spacecraft. The Falcon 9 rocket launched with a Block 4 First Stage that consists of an increased thrust on the Merlin 1D engines. The Second stage was a Block 4 but used the old Aluminum Grid Fins.
The First stage landed successfully at the Landing Zone 1.
This is the last Dragon mission in the original Commercial Resupply Services 1 contract with NASA.
Dragon is carrying an external payload on its trunk, the CREAM payload (Cosmic Ray Energetics and Mass Instrument) which is the newest addition to the Space Station’s astrophysics instrument suite that, among others, consists of NICER, CALET and AMS-2.
On Aug 16, the Dragon cargo spacecraft was captured by the station’s robotic arm and berthed it to the Harmony module, kicking off a 5 week stay at the space station.
Falcon 9 CRS-12 and trunk payload here