SpaceX Adjusts Launch Time for First Falcon Heavy Night Flight

SpaceX's Falcon Heavy rocket as seen waiting on the launchpad.
SpaceX's Falcon Heavy rocket as seen waiting on the launchpad. (Image credit: SpaceX/Twitter)

CAPE CANAVERAL, Fla. SpaceX is waiting until late in its 4-hour window to fire the engines on the massive Falcon Heavy rocket currently sitting on a launch pad here at Kennedy Space Center.

The company announced on Twitter that it would be targeting 2:30 a.m. EDT (0630 GMT) on June 25, three hours into the launch window for the mission. The statement didn't offer any details about why the decision was made. The mission will launch two dozen satellites into orbit, including payloads for NASA, the National Oceanic and Atmospheric Administration (NOAA), The Planetary Society and a host of universities.

"[T]eam completed additional ground system checkouts. Vehicle and payload continue to look good," a company spokesperson wrote.

Related: This Is What 2 Dozen Satellites Look Like Packed for Launch on a SpaceX Falcon Heavy

When it takes place, the launch will be the first night flight of the Falcon Heavy and the vehicle's first launch to loft multiple satellites into orbit. It will be the rocket's third flight overall, coming fast on the heels of the vehicle's first commercial launch of a large communications satellite called Arabsat-6A, in April.

The new flight, an Air Force coordinated launch dubbed Space Test Program 2 or STP-2, will also be the first Falcon Heavy mission to reuse boosters that have already flown to space, as the two side boosters are veterans of that April flight. The center core is new, after the Arabsat mission's center core landed safely but was lost overboard when choppy seas struck SpaceX's droneship.

With the new targeted launch time, SpaceX has just an hour-long window in which to complete the launch. If the company decides it isn't ready to go within that hour, it will default to a 4-hour backup window that opens June 25 at 11:30 p.m. EDT (0630 GMT) on June 26.

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Meghan Bartels
Senior Writer

Meghan is a senior writer at and has more than five years' experience as a science journalist based in New York City. She joined in July 2018, with previous writing published in outlets including Newsweek and Audubon. Meghan earned an MA in science journalism from New York University and a BA in classics from Georgetown University, and in her free time she enjoys reading and visiting museums. Follow her on Twitter at @meghanbartels.