Enlarge / SpaceX completed a static firing on Thursday evening ahead of Sunday’s planned launch.
SpaceX will look to continue its high launch cadence later on Sunday with its third mission in just nine days, and fourth in a month.
For the launch, a SpaceX Falcon 9 rocket will attempt to deliver the Intelsat 35e communications satellite to geostationary transfer orbit.
The launch window opens at 7:36pm ET and spans 58 minutes.
The primary concern is weather, with just a 40 percent chance of favorable conditions at launch time.
With a mass of 6,761kg, this is the heaviest satellite SpaceX has ever launched to geostationary orbit, about 36,000km above the Earth’s surface.
For this reason, the rocket will not have enough fuel reserves to attempt a safe return to Earth—even to a drone ship in the Atlantic Ocean.
This booster, therefore, is being expended.
If the Falcon 9 does fly Sunday, it would cap a remarkably productive period for SpaceX.
Already, the company has successfully launched nine missions in 2017, and this would be the company’s fourth flight since June 3.
Should inclement weather preclude a launch Sunday, a backup opportunity will come Monday, at 7:37pm ET.
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