SpaceX CRS-17, also known as SpX-17, is a Commercial Resupply Service mission to the International Space Station that will be launched in May 3rd, 2019 aboard a Falcon 9 rocket. The mission was contracted by NASA and is flown by SpaceX.
NASA has contracted for the CRS-17 mission from SpaceX and therefore determines the primary payload, date/time of launch, and orbital parameters for the Dragon space capsule. According to a 2016 presentation, the external payloads manifested for this flights were Orbiting Carbon Observatory 3 (OCO-3) and STP-H6.
Update April 23rd: Since the mishap at LZ-1 the other day, the first stage will now be landing on the ASDS “Of Course I Still Love You”.
Update April 30th: CRS-17 will now be targeting no earlier than May 3rd, 2019 3:11 AM EST.