A SpaceX Falcon 9 rocket stands on pad 40 at Cape Canaveral Space Force Station before launch with the SES 22 communications satellite. Credit: Stephen Clark / Spaceflight Now

SpaceX is preparing to launch a television broadcasting satellite Wednesday for SES, with liftoff of a Falcon 9 rocket from Cape Canaveral set for 5:04 p.m. EDT (2104 GMT).

There’s a two-hour window for SpaceX’s launch Wednesday, and the official launch weather outlook predicts an 80% chance of favorable weather for liftoff.

SpaceX ground crews rolled the Falcon 9 rocket and its commercial satellite payload to pad 40 earlier this week, and raised it vertical in the launch mount at pad 40 for final checkouts. The 229-foot-tall (70-meter) launcher will be filled with a million pounds of kerosene and liquid oxygen propellants in the final 35 minutes of the countdown Wednesday.

If weather and technical parameters are all “green” for launch, the nine Merlin main engines on the first stage booster will come to life with the help of an ignition fluid called triethylaluminum/triethylborane, or TEA-TEB. Once the engines are at full throttle, hydraulic clamps will open to release the Falcon 9 for its climb into space.

The nine main engines will produce 1.7 million pounds of thrust for about two-and-a-half minutes, propelling the Falcon 9 and the SES 22 communications satellite into the upper atmosphere. Then the booster stage — tail number B1073 in SpaceX’s fleet — will shut down and separate from the Falcon 9’s upper stage.

The booster will extend titanium grid fins and pulse cold gas thrusters to orient itself for a tail-first entry back into the atmosphere, before reigniting its engines for a braking burn and a final landing burn, targeting a vertical decent to the drone ship “A Shortfall of Gravitas” parked more than 400 miles (about 670 kilometers) east of Cape Canaveral.

The landing will mark the completion of the booster’s second flight to space, following a debut mission in May carrying Starlink internet satellites into orbit.

The upper stage’s single Merlin engine will fire two times to inject the SES 22 spacecraft into an elliptical, or oval-shaped, transfer orbit ranging more than 20,000 miles above Earth. Deployment of the SES 22 satellite from the Falcon 9 upper stage is scheduled at T+plus 33 minutes, 26 seconds, according to a mission timeline provided by SpaceX.

This map illustrates the predicted ground track for the Falcon 9 rocket on the SES 22 mission, with the locations of pad 40 and the drone ship “A Shortfall of Gravitas” labeled. Credit: Spaceflight Now

Built in France by Thales Alenia Space, the SES 22 satellite weighs about 7,700 pounds, or 3.5 metric tons, fully fueled for launch.

After separation from the Falcon 9 launcher, SES 22 will unfurl its solar panels and antennas, and perform a series of orbit-raising burns with a liquid-fueled engine to circularize its orbit at geostationary altitude over the equator. After completing in-orbit verification testing, SES 22 is scheduled to enter commercial service in early August, according to Christophe De Hauwer, SES’s chief strategy and development officer.

The SES 22 satellite is the first mission to replenish SES’s fleet of C-band television broadcast satellites to replace C-band capacity being transitioned to 5G cellular network services by the Federal Communications Commission.

“SES 22 is a C-band satellite, so it’s part of our program of for the C-band clearing in the U.S.,” De Hauwer said in a pre-launch interview with Spaceflight Now. “So it’s a C-band only satellite. It will be launched to 135 degrees west, which is the location we are replenishing, from where we will provide mostly TV and radio services over the U.S., but also some data services over the country.”

From its parking spot in geostationary orbit more than 22,000 miles (nearly 36,000 kilometers) over the equator at 135 degrees west longitude, SES 22 will begin a 15-year mission beaming cable TV programming for SES’s corporate clients.

The Federal Communications Commission’s finalized a program in 2020 to clear 300 megahertz of C-band spectrum for the roll-out of 5G mobile connectivity networks.

The FCC auctioned U.S. C-band spectrum — previously used for satellite-based video broadcast services to millions of customers — to 5G operators.

In compensation for losing the spectrum, SES is set to receive nearly $4 billion from the winners of an auction to redistribute the C-band capacity to 5G operators. The reimbursement will pay for the expense of building and launching the new satellites. Intelsat, another large C-band telecom operator, is set to receive nearly $5 billion to pay for its own new communications satellites.

SES ordered six new C-band broadcasting satellites, including one ground spare, from Thales Alenia Space, Boeing, and Northrop Grumman in 2020. SES 22 is the first of the six new satellites to reach the launch pad.

The remaining four C-band replacement satellites SES plans to send up are booked to launch in pairs on a United Launch Alliance Atlas 5 rocket and a SpaceX Falcon 9 rocket from Cape Canaveral later this year.

The SES 22 communications satellite during encapsulation inside SpaceX’s payload fairing. Credit: SpaceX

ROCKET: Falcon 9 (B1073.2)

PAYLOAD: SES 22 communications satellite

LAUNCH SITE: SLC-40, Cape Canaveral Space Force Station, Florida

LAUNCH DATE: June 29, 2022

LAUNCH WINDOW: 5:04-7:04 p.m. EDT (2104-2304 GMT)

WEATHER FORECAST: 80% probability of acceptable weather

BOOSTER RECOVERY: “A Shortfall of Gravitas” drone ship

LAUNCH AZIMUTH: East

TARGET ORBIT: Geostationary transfer orbit

LAUNCH TIMELINE:

T+00:00: Liftoff T+01:12: Maximum aerodynamic pressure (Max-Q) T+02:30: First stage main engine cutoff (MECO) T+02:33: Stage separation T+02:41: Second stage engine ignition T+03:24: Fairing jettison T+06:16: First stage entry burn ignition (three engines) T+06:42: First stage entry burn ends T+08:02: Second stage engine cutoff (SECO 1) T+08:07: First stage landing burn ignition (one engine) T+08:34: First stage landing T+27:08: Second stage engine restart T+28:15: Second stage engine cutoff (SECO 2) T+33:26: SES 22 separation

MISSION STATS:

161st launch of a Falcon 9 rocket since 2010 169th launch of Falcon rocket family since 2006 2nd launch of Falcon 9 booster B1073 140th Falcon 9 launch from Florida’s Space Coast 90th Falcon 9 launch from pad 40 145th launch overall from pad 40 103rd flight of a reused Falcon 9 booster 7th SpaceX launch for SES 82nd Thales Alenia Space-built satellite launched by SpaceX 27th Falcon 9 launch of 2022 27th launch by SpaceX in 2022 27th orbital launch based out of Cape Canaveral in 2022

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