SpaceX technicians tested a SpaceX Falcon 9 rocket booster in a "full-duration static fire" test at Vandenberg Air Force Base on Monday night.
Officials on the SpaceX Twitter feed said preliminary data looked good in advance of Sunday's Jason-3 launch.
During the static-fire test, which was a rehearsal of sorts, engineers verified that the two-stage rocket’s systems were performing as planned.
The launch is scheduled for Sunday at 10:42 a.m. The Falcon 9 rocket will carry an ocean-monitoring satellite as part of an international mission in partnership with NASA, among other agencies.
SpaceX has revealed that it will attempt to land the rocket’s first stage on a floating remote-controlled platform in the Pacific Ocean. If successful, it would be the first such landing ever performed.