Six months after a rocket exploded in June, SpaceX is on the verge of taking to the sky again—with a souped up Falcon 9 booster more powerful than anything the commercial spaceflight company has ever launched.

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On Sunday, SpaceX is tentatively scheduled to launch a new Falcon 9 rocket from Cape Canaveral Air Force Station. The rocket will ferry 11 OG2 satellites into orbit for telecommunications company Orbcomm Inc. Whether the launch proceeds as scheduled is unclear at this point, as SpaceX has not yet completed the pre-launch static engine test fire expected to occur Thursday. The static fire involves briefly blasting the rocket’s nine first stage Merlin engines while bolted to the ground at Space Launch Complex 40.

SpaceX has already made several failed attempts to land Falcon 9 boosters on ocean barges this year, as part of the company’s long-term goal of creating a reusable rocket system that would significantly reduce the cost of launching payloads into orbit.

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The rocket company has been unusually tight-lipped about the details of the upcoming launch—including whether it’ll be attempting to land the upgraded Falcon 9 booster after ferrying its payload into orbit.

In November, Blue Origin stole a little of SpaceX’s reusable rocket thunder, by sending a New Shepherd rocket to the edge of space and successfully landing it back on solid turf—a first in the history of spaceflight.

Image Credit: SpaceX / Flickr

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Earlier this month, a NASA spokesperson remarked that SpaceX would try to send its next booster into space and land it back at Cape Canaveral, but SpaceX has not confirmed this statement.

SpaceX has made several upgrades to the Falcon 9 since June, when a weak strut holding a helium tank in place snapped, setting off a chain reaction that caused the entire rocket to explode.

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The rocket’s first stage, or booster, now stands 230 feet (70 meters) tall—five feet taller than before. The additional length gives the rocket more room to carry fuel. What’s more, engine upgrades mean that the Falcon 9 can now generate up to 1.7 million pounds (7.5 meganewtons) of thrust. As Business Insider notes, that’s about 200,000 pounds more thrust than before, equivalent to adding another engine’s worth of power (the rocket runs on 9 Merlin engines).

While retrieving a Falcon 9 rocket after a satellite launch wouldn’t have been feasible in the past—commercial satellites are sent into higher orbits than the ISS—the new booster carries enough fuel for a return flight, according to Business Insider.

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Florida Today reports that the rocket currently sitting at Launch Complex 40 also includes a new “deep cryo” liquid oxygen system. Liquid oxygen propellant is now chilled to -340ºF (-207ºC), compared with -298ºF (-183ºC) before. The hope is that cooling the rocket fuel to near-freezing temperatures will increase the system’s overall performance. But according to SpaceX CEO Elon Musk, the deep cryo system is “presenting some challenges.” A static test fire of the engine was expected to occur yesterday, but as of this morning, the rocket was still vertical and waiting to fire.

If the static test fire doesn’t happen today, it’s unlikely that the launch will proceed as planned this weekend. We’ll be watching SpaceX’s progress closely and keeping you updated.

Correction 12/18: An earlier version of this article stated that the new Falcon 9 rocket would be able to generate 771,000 kg of thrust. In fact, kg is not a unit of force! Your friendly neighborhood science writer got confused and made a quick pounds-to-kilograms conversion without remembering that the English system is utter madness and pounds can be used to denote both force and mass. The correct metric conversion is now listed.

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Update 12/19: The static fire test was a success! SpaceX has confirmed plans to launch its upgraded Falcon 9 rocket on Sunday. The launch from Cape Canaveral is timed for 8:29 p.m. EST, and we’ll be covering it live here.

[Business Insider | Florida Today | NASA Spaceflight]


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Top: SpaceX’s new and improved Falcon 9 rocket, via SpaceX/Flickr