“Our action will allow SpaceX to begin deployment of Gen2 Starlink, which will bring next generation satellite broadband to Americans nationwide, including those living and working in areas traditionally unserved or underserved by terrestrial systems,” the FCC wrote in its Dec. 1 order partially approving the Starlink Gen2 constellation. “Our action also will enable worldwide satellite broadband service, helping to close the digital divide on a global scale.

“At the same time, this limited grant and associated conditions will protect other satellite and terrestrial operators from harmful interference and maintain a safe space environment, promoting competition and protecting spectrum and orbital resources for future use,” the FCC wrote. “We defer action on the remainder of SpaceX’s application at this time.”

Specifically, the FCC granted SpaceX authority to launch the initial block of 7,500 Starlink Gen2 satellites into orbits at 525, 530, and 535 kilometers, with inclinations of 53, 43, and 33 degrees, respectively, using Ku-band and Ka-band frequencies. The FCC deferred a decision on SpaceX’s request to operate Starlink Gen2 satellites in higher and lower orbits.

Like the first two Gen2 launches Dec. 28 and Jan. 26, the Starlink 5-3 mission Thursday will target the 530-kilometer-high (329-mile) orbit at an inclination of 43 degrees to the equator.

SpaceX currently has nearly 3,500 functioning Starlink satellites in space, with more than 3,100 operational and roughly 300 moving into their operational orbits, according to a tabulation by Jonathan McDowell, an expert tracker of spaceflight activity and an astronomer at the Harvard-Smithsonian Center for Astrophysics.

The first-generation Starlink network architecture includes satellites flying a few hundred miles up, orbiting at inclinations of 97.6 degrees, 70 degrees, 53.2 degrees, and 53.0 degrees to the equator. Most of SpaceX’s recent Starlink launches have released satellites into Shell 4, at an inclination of 53.2 degrees, after the company largely completed launches into the first 53-degree inclination shell last year.

Shell 5 of the Starlink network was widely believed to be one of the polar-orbiting layers of the constellation, at 97.6 degrees inclination. But the name of the first Gen2 missions — Starlink 5-1, 5-2, and 5-3 — appear to suggest SpaceX has changed the naming scheme for the Starlink shells.

SpaceX’s launch team will be stationed inside Firing Room 4 at Kennedy Space Center’s Launch Control Center for the overnight countdown. SpaceX will begin loading super-chilled, densified kerosene and liquid oxygen propellants into the Falcon 9 vehicle at T-minus 35 minutes.

Helium pressurant will also flow into the rocket in the last half-hour of the countdown. In the final seven minutes before liftoff, the Falcon 9’s Merlin main engines will be thermally conditioned for flight through a procedure known as “chilldown.” The Falcon 9’s guidance and range safety systems will also configured for launch.

After liftoff, the Falcon 9 rocket will vector its 1.7 million pounds of thrust — produced by nine Merlin engines — to steer southeast over the Atlantic Ocean. SpaceX has resumed launches this winter using the southeasterly corridor from Cape Canaveral, rather than trajectories to the northeast, to take advantage of better sea conditions for landing of the Falcon 9’s first stage booster.

Throughout the summer and fall, SpaceX launched Starlink missions on paths toward the northeast from Florida’s Space Coast.

The Falcon 9 rocket will exceed the speed of sound in about one minute, then shut down its nine main engines two-and-a-half minutes after liftoff. The booster stage will separate from the Falcon 9’s upper stage, then fire pulses from cold gas control thrusters and extend titanium grid fins to help steer the vehicle back into the atmosphere.

Two braking burns will slow the rocket for landing on the drone ship “A Shortfall of Gravitas” around 410 miles (660 kilometers) downrange approximately nine minutes after liftoff. The reusable booster, designated B1069 in SpaceX’s inventory, will launch and land for the fifth time in its career Thursday.

The Falcon 9’s reusable payload fairing will jettison during the second stage burn. A recovery ship is also on station in the Atlantic to retrieve the two halves of the nose cone after they splash down under parachutes.

Landing of the first stage on Thursday’s mission will occur just as the Falcon 9’s second stage engine cut off to deliver the Starlink satellites into orbit.

Separation of the 53 Starlink spacecraft, built by SpaceX in Redmond, Washington, from the Falcon 9 rocket is expected around 64 minutes after liftoff.

The Falcon 9’s guidance computer aims to deploy the satellites into a near-circular orbit at an inclination of 43 degrees to the equator, with an altitude ranging between 202 miles and 213 miles (325-by-343 kilometers). After separating from the rocket, the 53 Starlink spacecraft will unfurl solar arrays and run through automated activation steps, then use ion engines to maneuver into their operational orbit.

ROCKET: Falcon 9 (B1069.5)

PAYLOAD: 53 Starlink satellites (Starlink 5-3)

LAUNCH SITE: LC-39A, Kennedy Space Center, Florida

LAUNCH DATE: Feb. 2, 2023

LAUNCH TIME: 2:58:20 a.m. EST (0758:20 GMT)

WEATHER FORECAST: Greater than 90% chance of acceptable weather; Low to moderate risk of upper level winds; Low risk of unfavorable conditions for booster recovery

BOOSTER RECOVERY: “A Shortfall of Gravitas” drone ship northeast of the Bahamas

LAUNCH AZIMUTH: Southeast

TARGET ORBIT: 202 miles by 213 miles (325 kilometers by 343 kilometers), 43.0 degrees inclination

LAUNCH TIMELINE:

• T+00:00: Liftoff
• T+01:12: Maximum aerodynamic pressure (Max-Q)
• T+02:28: First stage main engine cutoff (MECO)
• T+02:31: Stage separation
• T+02:38: Second stage engine ignition
• T+02:43: Fairing jettison
• T+06:41: First stage entry burn ignition (three engines)
• T+07:00: First stage entry burn cutoff
• T+08:23: First stage landing burn ignition (one engine)
• T+08:35: Second stage engine cutoff (SECO 1)
• T+08:44: First stage landing
• T+1:03:56: Starlink satellite separation

MISSION STATS:

• 201st launch of a Falcon 9 rocket since 2010
• 211th launch of Falcon rocket family since 2006
• 5th launch of Falcon 9 booster B1069
• 172nd Falcon 9 launch from Florida’s Space Coast
• 61st SpaceX launch from pad 39A
• 155th launch overall from pad 39A
• 142nd flight of a reused Falcon 9 booster
• 71st Falcon 9 launch primarily dedicated to Starlink network
• 7th Falcon 9 launch of 2023
• 8th launch by SpaceX in 2023
• 6th orbital launch attempt based out of Cape Canaveral in 2023