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Atlas V 511 Rocket Assembled at Cape Canaveral Space Force Station

The USSF-8 mission will use United Launch Alliance’s (ULA’s) Atlas V 511 rocket to deliver the Geosynchronous Space Situational Awareness Program (GSSAP) spacecraft into orbits approximately 22,300 miles above Earth. Launch is targeted for Jan. 21.

The United States Space Force (USSF)-8 mission will use United Launch Alliance’s (ULA’s) Atlas V 511 rocket to deliver the Geosynchronous Space Situational Awareness Program (GSSAP) spacecraft into orbits approximately 22,300 miles (36,000 km) above Earth. (ULA Image)

It will be ULA’s 148th mission, the third to launch GSSAP satellites and the first Atlas V 511 rocket featuring the 17.7-foot payload fairing and a single side-mounted solid rocket booster.

Assembly of the rocket, designated AV-084, began Dec. 18 with the Launch Vehicle on Stand (LVOS) milestone at the Vertical Integration Facility (VIF). The 107-foot long first stage was delivered to the VIF, hoisted upright, and positioned aboard the Mobile Launch Platform (MLP) pedestals.

Attachment of the one GEM 63 solid-propellant motor to the first stage occurred on Dec. 20. The booster will provide nearly a third of the total thrust at liftoff to power the Atlas V on its journey to geosynchronous orbit.

The pre-assembled structure featuring the interstage, Centaur upper stage and lower halves of the payload fairing was raised atop the rocket today to complete initial buildup of the launch vehicle.

Testing of rocket systems will be completed after the holiday break, leading to the encapsulated payload arriving at the VIF for integration atop the Atlas V in early January. The completed rocket will stand 196 feet tall.

The launch is targeted for Jan. 21. (ULA Image)

The 511 rocket configuration is the only Atlas V variant not yet flown. However, the Atlas V 411 with the smaller 13.1-foot fairing and a single solid rocket booster has successfully launched a half-dozen times.

How can such a seemingly unbalanced launch vehicle fly properly? The answer starts with the solid rocket boosters’ stationary nozzles. They align with the overall rocket’s center of gravity, and the Atlas V’s dual-nozzle main engine provides ample control authority to steer the rocket smoothly through the sky.


The design vision of the Atlas V program provides a launch vehicle that is tailored to the needs of its payload. The family features the ability to add solid rocket boosters for more liftoff thrust and makes available different diameters and lengths of payload fairings.

These various accommodations will continue in the next generation Vulcan Centaur rocket, which can be flown with 0, 2, 4 or 6 solid rocket boosters and payload fairings in lengths of either 51 feet and 70 feet.

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The Space Force’s Space Systems Command competitively selected the Atlas V 511 for the USSF-8 mission. The rocket configuration provides the right amount of performance to deliver the GSSAP satellites into their desired orbit.

This will be ULA’s 148th mission, the third to launch GSSAP satellites and the first Atlas V 511 rocket featuring the 17.7-foot (5.4-meter) payload fairing and a single side-mounted solid rocket booster. (ULA Image)

The Atlas V 511 will weigh 858,115 pounds once fully fueled at liftoff and produce 1.2 million pounds (5.5 mega-Newtons) of thrust.

GSSAP is a space-based capability that collects space situational awareness data, allowing for more accurate tracking and characterization of human-made orbiting objects. The satellites have clear, unobstructed, and distinct vantage points for viewing resident space objects orbiting earth in a near-geosynchronous orbit without the weather or atmosphere disruptions that limit ground-based observations.

The data from GSSAP greatly improves our ability to rapidly detect, warn, characterize and attribute disturbances to space systems in the geosynchronous environment.

Talk of Titusville will always be free to access.
If you love what we’re doing, please consider becoming a monthly Patreon Supporter HERE.

ULA successfully launched the first two GSSAP missions in 2014 and 2016 using Delta IV Medium+ (4,2) rockets from Cape Canaveral, Fla.

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