Artemis II - Acronyms & Terminology Glossary

• ACES – Advanced Crew Escape Suit
• Affirm – Affirmative ('yes' confirmation)
• AGA – Anomaly Gas Analyzer (crew cabin)
• Albedo – proportion of sunlight reflected by an astronomical object (typically measured from 0.0 to 1.0)
• AOS – Acquisition of Signal
• Apogee – highest orbital point around Earth
• ARB – Apogee Raise Burn
• AROW – Artemis Real-time Orbit Website
• ATB – Apogee Trim Burn
• ATP – Authorization to Proceed
• Attitude – orientation of the spacecraft (measured as Yaw / Pitch / Roll)
• AVATAR – A Virtual Astronaut Tissue Analog Response (medical experiment)
• BME – Biomedical officer
• BOOSTER – Booster systems officer
• BPC – Boost Protective Cover
• Burn – rocket engine firing
• CAPCOM – Capsule Communicator
• CCD – Cursor Control Device (miniature joystick-like remote control)
• CCS – Command and Control System
• CCU – Collapsible Contingency Urinal (waste management subsystem)
• CDR – Commander
• CM – Crew Module
• CMUS – Crew Module Uprighting System (i.e., after splashdown)
• COM, comm[s] – Communications
• Copy – message received and understood
• CSA – Canadian Space Agency
• CSM – Crew & Service Module (CM & SM together)
• Deadband – tolerance for the spacecraft's attitude, without firing thrusters to correct
• Delta-V – Change in velocity
• Deorbit burn – maneuver intended to land a spacecraft from orbit
• Depress – Depressurization of air (e.g., in a spacecraft)
• DFTO – Developmental Flight Test Objective
• Downlink – transmission from the spacecraft to Earth
• DPC – Daily Planning Conference
• DSN – Deep Space Network (communications)
• DTE – Direct-To-Earth (communications link)
• DU – Display Unit (main control panel)
• ECLSS – Environmental Control and Life Support Systems
• EECOM – Electrical, Environmental, and Consumables Manager
• EI – Entry Interface (re-entering Earth's atmosphere)
• Emer Comm – Emergency Communications (via the Deep Space Network)
• ESM – European Service Module
• Equigravisphere – region where the Moon's gravitational pull equals that of Earth's
• FAO – Flight Activities Officer
• FCR – Flight Control Room (at Mission Control Center, Houston)
• FD – Flight Director
• FDO – Flight Dynamics Officer
• FIDO – Flight Dynamics Officer (legacy)
• Forward link – Uplink path from ground to spacecraft
• Free-return – Trajectory which will ultimately bring the spacecraft back to Earth
• FTS – Flight Termination System (i.e., destruct)
• G&C / GNC – Guidance, Navigation, and Control
• Go / No-Go – readiness status polling
• HEO – High Earth Orbit
• HH&P – Human Health and Performance
• HRP – Human Research Program
• ICPS – Interim Cryogenic Propulsion Stage
• IMU – Inertial Measurement Unit
• In the blind – transmitting without confirmed comms
• INCO – Integrated Communications Officer
• Integrity – proper name of the Orion spacecraft for the Artemis II mission
• IVA – Intra-Vehicular Activities officer
• JSC – Johnson Space Center (Houston, TX)
• KSC – Kennedy Space Center (Merritt Island, FL)
• LAS – Launch Abort System
• LCC – Launch Commit Criteria
• LCC – Launch Control Center (at KSC)
• LEO – Low Earth Orbit
• LH2 – Liquid Hydrogen
• LLO – Low Lunar Orbit
• LOI – Lunar Orbit Insertion
• LOS – Loss of Signal
• LOX – Liquid Oxygen
• LRO – Lunar Reconnaissance Orbiter
• LTP – Lunar Targeting Package/Plan
• MCC – Mission Control Center
• MCC-H – Mission Control Center Houston
• MECO – Main Engine Cutoff
• MER – Mission Evaluation Room
• MET – Mission Elapsed Time
• ML – Mobile Launcher (i.e., crawler)
• MOCR – Mission Operations Control Room (former name for Mission Control)
• MPO – Mechanical and Power Officer
• MPS – Main Propulsion System
• MS – Mission Specialist
• NAV – Navigation officer
• Nominal – within expected parameters
• O2O – Optical Communications System (high-bandwidth laser downlink)
• OCSS – Orion Crew Survival System (orange pressurized spacesuits)
• Off-nominal – Outside expected parameters
• OFW – Orion Flywheel (exercise device)
• OMS – Orbital Maneuvering System (part of the European Service Module)
• Orion – Upper portion of the Artemis spacecraft (LAS / CM / SM)
• OTC – Outbound Trajectory Correction (course adjustment maneuver during trip from Earth)
• Out of family – data outside expected range; outlier
• PAO – Public Affairs Office[r]
• PCD – Portable Computing Device
• Perigee – lowest orbital point around Earth
• PFC – Private Family Conference
• PMC – Private Medical Conference
• PRB – Perigee Raise Burn
• PRM – Perigee Raise Maneuver
• PROP – Propulsion officer
• Prox – Proximity
• PTC – Passive Thermal Control (maneuver)
• PTT – Push-to-talk (communications)
• PWD – Potable Water Dispenser
• RCS – Reaction Control System
• Readback – detailed verification of information conveyed
• Return link – Downlink path from spacecraft to ground
• RF – Radio Frequency
• RHC – Rotational Hand Controller (controls spacecraft Yaw / Pitch / Roll)
• RTC – Return Trajectory Correction (course adjustment maneuver during return to Earth)
• S-Band – communications frequency band
• SAW – Solar Array Wing
• SER – Science Evaluation Room
• Sim – Simulation (flight training)
• SIP – Switch Interface Panels (main control panel)
• Sit Rep – Situation Report (verbal commentary)
• SLS – Space Launch System
• SM – Service Module (the ESM)
• SMOR – Science Mission Operations Room
• SRB – Solid Rocket Booster
• T-0 – Launch time
• TDRS – Tracking and Data Relay Satellite
• THC – Translational Hand Controller (controls spacecraft Forward-Back / Left-Right / Up-Down)
• TIG – Time of Ignition (planned)
• TIGO – Time of Ignition (actual)
• TLI – Translunar Injection
• TPS – Thermal Protection System
• UHF – Ultra High Frequency
• Uplink – transmission from Earth to the spacecraft
• USS – Upper Stage Separation
• UWMS – Universal Waste Management System (toilet)
• VAB – Vehicle Assembly Building (Merritt Island, FL)
• VHF – Very High Frequency
• VLDR – Very Low Data Rate (communications)
• VOX – Voice-activated (communications)
• WDR – Wet Dress Rehearsal (i.e., with liquid fuels loaded)
• Wilco – Will Comply
• Window – Launch or maneuver opportunity
• WMS – Waste Management System