Atlas V launches TDRS-M relay satellite for NASA

Source: SpaceFlight Insider

"A United Launch Alliance (ULA) Atlas V rocket roared off the pad with NASA's newest communications spacecraft, Tracking and Data Relay Satellite M (TDRS-M). Liftoff took place at 8:29 a.m. EDT (12:29 GMT) on August 18, 2017. The launch occurred about 26 minutes into a 40-minute window due to an issue detected on the vehicle's Centaur upper stage engine, the RL10C. Thermal conditioning took a bit longer than planned. The pre-chill eventually took place, clearing the way for a successful liftoff and eventual satellite deployment." (08/18/17)

http://www.spaceflightinsider.com/organizations/ula/atlas-v-launches-tdrs-m-data-relay-satellite-nasa/