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An Atlas 5 launch vehicle with five GEM 63 solid rocket boosters and a Centaur upper stage with an RL10C-1 engine will launch the U.S. Space Force STP-3 mission from Space Launch Complex-41 at Cape Canaveral, Fla. Credit: United Launch Alliance One of the payloads on STP-3 is NASA’s Laser Communications Relay Demonstration

WASHINGTON — United Launch Alliance is targeting a Nov. 22 liftoff for the U.S. Space Force STP-3 mission aboard an Atlas 5 rocket. 

The mission previously was scheduled to launch June 23 from Cape Canaveral but was delayed to investigate an issue in the Atlas 5’s RL-10 upper stage engine. 

The Atlas 5 551 will fly with five solid rocket boosters and launch two satellites directly to geosynchronous orbit. 

STP-3’s primary payload is the STPSat-6 satellite built by Northrop Grumman. It will carry NASA’s Laser Communications Relay Demonstration (LCRD), an end-to-end optical relay that will send and receive data from space to the ground. According to NASA, LCRD also will conduct optical communications relay services with a future terminal on the International Space Station and will help to prove the viability of using laser communications in future missions to the Moon and Mars.

Also on STPSat-6 is a nuclear treaty verification payload from the National Nuclear Security Administration called SABRS-3, short for Space and Atmospheric Burst Reporting System-3.  The STPSat-6 spacecraft additionally will carry seven smaller science and technology payloads selected by the Defense Department’s Space Test Program.

The secondary payload on STP-3 is a U.S. Space Force small-satellite deployer system called Long Duration Propulsion ESPA-1 (LDPE-1). This is a propulsive ESPA ring (EELV Secondary Payload Adapter) holding up to six payloads.

The launch of this mission has been long awaited. The Air Force in 2017 awarded ULA a $191.1 million contract to launch STP-3 in 2019. The delays were caused by a combination of payload development setbacks, the pandemic and most recently the RL-10 engine issue.

 



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