SpaceX will debut its long-promised Starlink Version 3 satellites during a suborbital test flight of its Starship rocket on Thursday evening.
The Starship Flight 13 mission is the second launch of a third-generation Starship-Super Heavy launch vehicle and the second mission for the program this year.
Liftoff from Pad 2 at SpaceX’s Starbase facilities in southern Texas is scheduled during a 90-minute window that opens at 5:45 p.m. CDT (6:45 p.m. EDT / 2245 UTC).
Spaceflight Now will have live coverage beginning about two hours prior to liftoff.
SpaceX is launching this mission using Booster 20 and the Ship 40 upper stage. Both stages are flying for the first time and SpaceX will not attempt to recover either for reuse.
One of the biggest differences between Flight 13 and Flight 12, which launched in May, is that this time around, SpaceX will be deploying 20 production Starlink V3 satellites. While they’re not going into orbit, SpaceX does intend to briefly link them to the broader network in low Earth orbit.
“As part of this initial test, Starship is planned to deploy 20 satellites which will extend solar arrays and antennas and will attempt to connect with the larger Starlink constellation via high-capacity lasers,” SpaceX wrote prior to launch. “The Starlink satellites will be on the same suborbital trajectory as Starship and are expected to demise upon reentry approximately 20 minutes after deployment.”
Other mission objectives are fairly similar to what was demonstrated in Flight 12. Those include a relight of a Raptor engine on the upper stage during the coast phase and performing a controlled landing of the booster in the Gulf of Mexico. Neither of those objectives were able to be accomplished back in May.
SpaceX said the startup sequence of the engines on Ship 39 “caused the directional flip of the booster to be off by approximately 90 degrees.” That coupled with issues with five out of 33 sea-level engines on the booster prevented a nominal boostback burn and Booster 19 was lost prematurely.
“The Super Heavy on this upcoming flight has hardware modifications to improve re-light reliability along with updates to engine alarms and aborts to match the conditions seen in the multi-engine flight environment,” the company wrote.
In between these two flights of Starship Version 3, SpaceX said it also made “several hardware an operational modifications” to address issues that caused one of the three Raptor Vacuum engines to go offline less than a minute after stage separation.
SpaceX is also continuing its heat shield iterative work in order to produce a protective system that will eventually allow for rapid reuse of the upper stage.
“Multiple tiles will be attached to the metallic side of Starship’s aft flaps along with modified tiles and attachment mechanisms in the heat shield covering the aft skirt to gather flight data on different attachment options,” SpaceX said. “Finally, Starship’s heat shield will have load sensing tiles to take measurements as the vehicle experiences higher dynamic pressure on ascent than previous flights, putting added stress on the tile attachments in exchange for increased payload to orbit capability.”
Gwynne Shotwell, SpaceX’s president and chief operating officer, told CNBC in an interview in June that the company may attempt to perform an orbital launch as soon as Flight 14, depending on how this next mission goes. She said a monthly launch cadence is the company’s target.
Rapid learning will be critical as NASA is relying on SpaceX to get Starship to orbit sooner rather than later. A modified version of a Starship Version 3 rocket with a docking adaptor is scheduled to fly next years part of the Artemis 3 mission.
Unlike Blue Origin’s Blue Moon Mark 2 Alpha spacecraft, the Artemis 3 crew will not enter into Starship on that flight, but rather NASA and SpaceX will focus on testing the interaction of these two vehicles when they dock.
“Software testing between spacecrafts will help demonstrate that the commercial human landing system prototypes and Orion can meet at a precise time and location in space,” NASA said in a press release on Wednesday. “When Orion docks with the Blue Moon test lander, the Orion spacecraft’s software will control the docked spacecraft. Meanwhile, the SpaceX test article will control the docked spacecraft for the second portion of the mission.”
Flight 13 is also SpaceX’s first mission for the Starship program since it became a publicly traded company on the Nasdaq. The company’s new investors will be keenly watching the performance of the launcher and launch infrastructure as SpaceX hopes to begin deploying orbital payloads later this year.
