United Launch Alliance (ULA) delivered the flight-ready Interim Cryogenic Propulsion Stage-2 (ICPS-2) to the Kennedy Space Center on March 9 to fulfill our contribution to the Artemis II launch in NASA's lunar exploration program.

The ICPS-2 was manufactured by ULA in collaboration with Boeing to serve as the upper stage to the Space Launch System (SLS) mega rocket, which will launch an international crew of four astronauts around the Moon on the Artemis II mission.

ULA built the stage at the rocket factory in Decatur, Alabama, then shipped ICPS-2 to Cape Canaveral Space Force Station in Florida for final testing and check out activities.

With that work now completed, ICPS-2 was moved from ULA's Delta Operations Center high bay to NASA's Multi-Payload Processing Facility (MPPF) at Kennedy Space Center. Standing more than 45 feet tall and secured in its Vertical Transport Fixture, the ICPS rode aboard an Elevating Platform Transporter that provided hydraulic leveling and precision positioning capabilities along the route.

Technicians at the MPPF will load hydrazine in the ICPS-2's attitude control system to make in-flight maneuvers and prep the stage for its forthcoming transfer to the Vehicle Assembly Building (VAB) to undergo stacking operations.

The ICPS is based on the five-meter-diameter version of ULA's Delta Cryogenic Second Stage (DCSS) that flew for two decades on the Delta IV rocket with 100 percent mission success. ICPS-1 performance for the Artemis I mission was nominal, delivering the push needed to send Orion out of Earth orbit to travel around the Moon in 2022.

ICPS features a slightly larger liquid hydrogen tank as compared to the Delta IV second stage, as well as electrical and mechanical interfaces specific to attaching and supporting the Orion spacecraft, and a second hydrazine bottle for additional attitude control propellant.

The ICPS for Artemis II also includes an Emergency Detection System (EDS) and other hardware changes specific to astronaut safety.

The stage feeds liquid hydrogen and liquid oxygen to the RL10C-2 main engine to produce 24,750 pounds (110.1 kilo-Newtons) of highly efficient thrust.

ICPS-2 also carries an approach target that the Artemis II astronauts will use to maneuver Orion in close proximity to the stage shortly after launch as part of a manual piloting evaluation test. Learn more about the test.

The ICPS-2 stage on Artemis II will provide the boost for the Orion capsule and its astronauts to reach a high Earth orbit where the spacecraft will temporarily loiter to undergo testing before it departs on the lunar flyby trajectory.

The Artemis II crew includes Commander Reid Wiseman, Pilot Victor Glover, Mission Specialist 1 Christina Hammock Koch and Mission Specialist 2 Jeremy Hansen.