Interim Cryogenic Propulsion Stage

E65412

The Interim Cryogenic Propulsion Stage is a liquid hydrogen–liquid oxygen upper stage used on early NASA Space Launch System missions to provide orbital insertion and translunar injection capability before the introduction of a more powerful exploration upper stage.


Statements (48)
Predicate Object
instanceOf cryogenic rocket stage
rocket upper stage
spacecraft propulsion module
agency NASA
basedOn Delta Cryogenic Second Stage
compatiblePayload Orion spacecraft
countryOfOrigin United States
designLife single use
developer Boeing
diameter 5 meters
engine RL10B-2
engineCycle expander cycle
engineManufacturer Aerojet Rocketdyne
firstFlightDate 2022-11-16
firstFlightVehicle Space Launch System Artemis I core stack
fuel liquid hydrogen
fuelTankMaterial aluminum-lithium alloy
guidanceSystem inertial navigation system
launchSiteForFirstFlight Kennedy Space Center LC-39B
launchVehicleFamily NASA Space Launch System
length 13.7 meters
manufacturer Boeing
missionProfileRole injection of Orion spacecraft toward the Moon
numberOfEngines 1
operator NASA
orbitCapability injection to high Earth orbit
translunar trajectory insertion
oxidizer liquid oxygen
oxidizerTankMaterial aluminum-lithium alloy
plannedToBeReplacedBy Exploration Upper Stage
primaryFunction orbital insertion
translunar injection
programRole interim upper stage before Exploration Upper Stage
propellant liquid hydrogen
liquid oxygen
propulsionType chemical rocket
replaces no previous SLS upper stage
separationInterface Orion Stage Adapter
specificImpulseVacuum approximately 462 seconds
status operational
structureDiameter 5 meters
thrustVacuum approximately 110 kN
usedForProgram Artemis program
usedOnLaunchVehicle Space Launch System
usedOnLaunchVehicleVariant SLS Block 1
usedOnMission Artemis I
Artemis II
Artemis III


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