Interim Cryogenic Propulsion Stage (ICPS)

Giving Orion the big push needed to fly beyond the Moon.

  • ICPS is a modified Delta IV Cryogenic Second Stage for NASA's Artemis program.

  • For the Artemis I mission, the stage will feed liquid hydrogen and liquid oxygen to the Aerojet Rocketdyne RL10B-2 main engine to produce 24,750 pounds (110.1 kilo-Newtons) of highly efficient thrust.

  • ULA is building three ICPS stages for each of the first three Artemis missions to the Moon through a collaborative partnership with Boeing.

  • NASA's SLS with ICPS is the most powerful rocket ever developed, producing 8.8 million pounds of thrust during liftoff to loft a vehicle weighing nearly six million pounds.



What is ICPS?


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Status Check Blog

ICPS-1: ULA teams support Artemis I countdown and launch
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ICPS-1: Stage stacked atop first SLS rocket
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ICPS-2: ULA-built upper stage arrives for Artemis II launch
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ICPS-2: Rendezvous target guides Artemis II Orion demonstrations
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ICPS-3: Upperstage that will propel Artemis III astronauts to the Moon arrives for processing
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