https://phys.org/news/2018-05-grace-fo-spacecraft-ready.html

GRACE-FO, a collaborative mission of NASA and the German Research Centre for Geosciences (GFZ), continues the work of the original GRACE mission in observing the movement of water and other mass around our planet by tracking the changing pull of gravity very precisely.

On liftoff, the Falcon 9 first-stage engines will burn for approximately 2 minutes and 45 seconds before shutting down at main engine cutoff (MECO). The Falcon 9's first and second stages will separate seconds later. Then, the second-stage engine will ignite for the first time (SES1) and burn until the vehicle reaches the altitude of the injection orbit, 305 miles (490 kilometers).