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O

OB —  OE —  OM —  OR —  OTA

ACRONYM	DEFINITION	CONTRIBUTOR
O & C	Operations and Control	CASI
O&GS	Operations and Ground System (Project)	Goddard
O&M	Operations and Maintenance	Goddard
O/O	On/Off	Goddard
O/PM	Output Module	Goddard
O/V	Over Voltage	Goddard
OA	Office Automation	Goddard
OA	Operations Agreement	Goddard
OA	Operations Astronomer	Goddard
OA	NASA Office of the Administrator	CASI
OA	Office of Applications	CASI
OACSIDA	Office of the Assistant Chief of Staff for Intelligence, Dept. of the Army, Washington, DC	CASI
OAF	Optical Alignment Facility	Goddard
OAG	Official Airline Guide	Langley
OAI	Ohio Aerospace Institute	Goddard
OAI	Open Archives Initiative (interoperability standards for online documents)	CASI
OAO	Orbiting Astronomical Observatory	CASI
OAO 3	Copernicus Observatory	CASI
OAOAF	Operations Analysis Office, Air Force, Washington, DC	CASI
OAOAFLC	Operations Analysis Office, Air Force Logistics Command, Wright-Patterson Air Force Base, OH	CASI
OARE	Orbital Acceleration Research Experiment	CASI
OART	Office of Advanced Research and Technology	CASI
OASES	Outpost for the Analysis and Spectroscopy of ExoPlanetary Systems	CASI
OASIS	Office Automation and Systems Improvement Standards	Goddard
OASIS	Operations and Science Instrument Support (U of Colorado s/w)	Goddard
OASIS	OEX Autonomous Supporting Instrumentation System	CASI
OASPL	Overall Sound Pressure Level	CASI
OAST	Office of Aeronautics and Space Technology	CASI
OASTFLYER	Office of Aeronautics and Space Technology-Flyer	CASI
OASYS	Orbit Analysis System	Goddard
OAT	Orbit Adjust Thrusters	CASI
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OB	Optical Bench	Goddard
OB	Octave Band	CASI
OBAS	Optical Bench Alignment System	Goddard
OBASS	Optical Bench Alignment Support Structure	Goddard
OBC	On-Board Computer	Goddard
OBCTE	On-Board Computer Test Equipment	Goddard
OBDH	On-Board Data Handling	Goddard
OBDHTE	On-Board Data Handling Test Equipment	Goddard
OBDI	On-Board Decoder Interface	Goddard
OBDS	On-Board Decoder Simulator	Goddard
OBE	On-Board Equivalent	Goddard
OBE	Optical Bench Enclosure	Goddard
OBETC	Optical Bench Enclosure Thermal Control	Goddard
OBFM	On-Board Fault Management	Goddard
OBP	On-Board Processor	Goddard
OBPR	Office of Biological and Physical Research	CASI
OBR	Outer Boot Ring	CASI
OBS	Organization Breakdown Structure	Langley
OBS	Operational Bioinstrumentation System (Space Shuttle)	CASI
OBSS	Orbiter Boom Sensor System	CASI
OC	Oversite Committee	Langley
OCA	Optical Company of America	Goddard
OCA	Oceanic Control Areas	CASI
OCC	Operations Control Center	CASI
OCD	Operating Control Directive	Goddard
OCD	Operations Concept Document	Goddard
OCE	Optical Control Electronics	Goddard
OCE-EK	Optical Control Electronics-Enhancement Kit	Goddard
OCF	Operational Control Field	Goddard
OCI	Ocean Color Imager	CASI
OCLC	Online Computer Library Center	Langley
OCLI	Optical Coatings Laboratory, Inc.	Goddard
OCMIP	Ocean Carbon-cycle Model Intercomparison Project	Goddard
OCP	Office of Commercial Programs (NASA)	CASI
OCPP	Orbiter Cloud Photopolarimeter (Pioneer)	CASI
OCR	Operational Control Room	Goddard
OCR	Optical Character Reader	Langley
OCR	Optical Character Recognition	CASI
OCS	Ocean Color Scanner	Langley
OCS	Optical Control Subsystem	Goddard
OCT	Octave	Langley
OCTS	Ocean Color and Temperature Scanner	CASI
OCTW	Optical Communication Thru the Shuttle Window Flight Demonstration	CASI
OCXO	Oven-Controller Crystal Oscillator	Goddard
OD	Operational Downlink	Goddard
OD	Operations Directives	Goddard
OD	Operations Director	Goddard
OD	Optical Disk	Goddard
OD	Orbit Determination	Goddard
ODA	Open Document Architecture	CASI
ODAS	Ocean Data Acquisition Systems	Langley
ODB	Operations Database	Goddard
ODC	Other Data Center	CASI
ODC	Other Direct Costs	CASI
ODC	Ozone Depletion Compound	CASI
ODE	Orientation Drive Electronics	Goddard
ODE	Ordinary Differential Equation	CASI
ODF	Orbit Determination Facility	Goddard
ODIN	Outsourcing Desktop Initiative for NASA	Goddard
ODM	Operational Data Message	Goddard
ODM	Optical Detector Subsystem	Goddard
ODR	Optical Data Recorder	Goddard
ODS	Orbit Determination System	Goddard
ODSRS	Orbiting Deep Space Relay Station	CASI
ODTC	Office of Defense Trade Controls	Goddard
ODU	Old Dominion University	Langley
ODUS	Ozone Dynamics Ultraviolet Spectrometer	Goddard
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OE	NASA Office of Exploration	CASI
OEA	OEA Aerospace (company)	Goddard
OECO	Outboard Engine Cutoff	CASI
OEF	Operations Evaluation Group, Office of Naval Operations	CASI
OEIC	Opto-Electronic Integrated Circuit	CASI
OEM	Original Equipment Manufacturer	Goddard
OEOP	Office Equal Opportunity Program	Goddard
OES	Office of Earth Science	Goddard
OEX	Orbiter Experiments	CASI
OFAD	Optical Field Angle Distortion	Goddard
OFHC	Oxygen-Free, High-Conductivity (Copper)	CASI
OFP	Operational Flight Plan	CASI
OFPP	Office of Federal Procurement Policy	Goddard
OFT	Orbital Flight Test	CASI
OFT	Orbiter Flight Test	CASI
OFTT	Operational Flight and Tactics Trainer	CASI
OGCM	Ocean General Circulation Model	Goddard
OGO	Orbiting Geophysical Observatory	CASI
OGSE	Optical Ground Support Equipment	Goddard
OH	Hydroxyl radical	Goddard
OHA	Operations Hazard Analysis	Goddard
OHSEB	Occupational Health and Safety Executive Board	Goddard
OI	Operational Instrumentation (Space Shuttle)	CASI
OIATU	Office of Industry Affairs and Technology Utilization	CASI
OIG	Office of Inspector General	Goddard
OIG	Orbital Information Group	Goddard
OIM	Oxygen Interaction with Materials	CASI
OIRA	Office of Information and Regulatory Affairs	Goddard
OIS-D	Operational Intercommunication System - Digital	Goddard
OIS-Q	Quintron OIS	Goddard
OKID	Observer/Kalman filter Identification	CASI
OLCAS	On-line Cost Accruals System	Goddard
OLCAS	On-Line COSTAR Alignment System	Goddard
OLD	Off-Load Device	Goddard
OLD	Operations Limitation Document	Goddard
OLE	Object Linking and Embedding	CASI
OLMSA	Office of Life and Microgravity Sciences and Applications	Goddard
OLP	Off-Line Processor	Goddard
OLPS	Open Literature Processing System	CASI
OLR	Outgoing Longwave Radiation	Langley
OLR	Outgoing Long-Wave Radiation	Langley
OLS	On-Line System	Goddard
OLS	Operational Linescan System	Goddard
OLS	Orbital Launch Services	Goddard
OLS	Optical Line Scanner	CASI
OLT	Observatory Level Test	Goddard
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OM	Operations Manager	Goddard
OM	Optical Model	Goddard
OM	Optics Module	Goddard
OMA	Office of Minority Affairs	Goddard
OMA	Optomechanical Assembly	Goddard
OMB	Office of Management and Budget	CASI
OMDC	Orbital Meteoroid and Debris Counting	Langley
OMEGA	Office of the MAP Experiment General Archive	Goddard
OMEI	Other Minority Education Institutions	Goddard
OMG	Object Management Group	Goddard
OMI	Ozone Monitoring Instrument	CASI
OMIS	Optical Multi-channel Imaging Sensor	Goddard
OMPS	Ozone Mapper and Profiler Suite	Goddard
OMS	Observatory Monitoring System	Goddard
OMS	Orbital Maneuvering System	CASI
OMSF	Office of Manned Space Flight	CASI
OMT	Orthomode Transducer	Goddard
OMU	Other Minority Universities	Goddard
OMV	Orbital Maneuvering Vehicle	CASI
OMVPE	Organo-metallic Vapor Phase Epitaxy	CASI
ONA	On-Line Archive	Goddard
ONERA	Office National d’Etudes et de Recherché Aerospatiales	CASI
ONI	Office of Naval Intelligence, Washington, DC	CASI
ONLS	On-Line System	Goddard
ONR	Office of Naval Research, Washington, DC	CASI
ONRL	Office of Naval Research, London	CASI
ONS	Onboard Navigation Systems	CASI
OOE	Out-of-Elliptic	CASI
OOL	Out of Limits	Goddard
OOM	On-Orbit Maintenance	Goddard
OOMA	Object-Oriented Modular Approach	Goddard
OOPS	On-Line Operating Plan System	Goddard
OOS	Orbitto-Orbit Stage	CASI
OOT	Out of Tolerance	Goddard
OP	Operating Procedure	Goddard
OP	Orbit Prediction	Goddard
OPA	NASA Office of Public Affairs	CASI
OPAC	On-line Patron Catalog	Langley
OPAC	Online Public Access Catalog	CASI
OPB	Out of Plane Bending	Goddard
OPD	Operations Department of ST Sci	Goddard
OPD	Optical Path Difference	Goddard
OPE	ORU Protective Enclosure	Goddard
OPE	One Pion Exchange	CASI
OPEN	Origins of Plasmas in the Earth's Neighborhood	CASI
OPEP	Orbit Plane Experiment Package (for use on OGO)	CASI
OPF	Official Personnel Folder	Goddard
OPF	Orbiter Processing Facility	CASI
OPIE	Oxygen Profiling Infrared Experiment	CASI
OPIS	Operational Satellite Improvement Program	CASI
OPLE	Omega Position Location Equipment	CASI
OPM	Office of Personnel Management (Previously, Civil Service Commission)	CASI
OPM	Operations Message	Goddard
OPM	Optical Properties Monitor	CASI
OPMI	Output Module Interface	Goddard
OPMIS	Optical Propulsion Management Interface System	CASI
OPO	Office of Public Outreach	Goddard
OPO	Operations Order	Goddard
OPR	Office of Primary Responsibility	Goddard
OPS	Operations	Langley
OPT	Office of Telecommunications Policy	CASI
OPUS	OSS-PODPS Unified System	Goddard
OPUS	Organization of Persistent Upwelling	CASI
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OR	Operations Room	Goddard
OR	Ordinary Proton (Event)	CASI
OR	Operations Requirements	Goddard
OR	Observed Ratio	CASI
ORA	Office of Research Analyses, Holloman Air Force Base, NM	CASI
ORA	Optical Research Associates	Goddard
ORBCOMM FM	System of Commercial Communications Satellites	Goddard
ORBIs	Orbiting Radio Bearer Ionospheric Satellite	CASI
ORD	Operations Requirements Document	Goddard
ORDLEC	Ohio River Div. Labs., Engineer Corps, Cincinnati	CASI
OREX	Orbital Reentry Experiment	CASI
ORF	Orbital Reference Frame	Goddard
ORFEUS	Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer	CASI
ORGEL	Organic Cooled, Heavy Water Moderated Reactor (Euratom)	CASI
ORI	Orbital Replacement Instrument	Goddard
ORI	ORI Incorporated	Goddard
ORIC	Oak Ridge Isochronous Cyclotron	CASI
ORION	Operational Radio Interferometry Observing Network	CASI
ORM	Optical Reference Measurement	Goddard
ORNL	Oak Ridge National Laboratory (DAAC)	Goddard
ORR	Operational Readiness Review	Goddard
ORR	Orroral Valley, Australia GSTDN Tracking Station	Goddard
ORS	On-line Reprogramming System	Goddard
ORS	Orbiter Refueling System	CASI
ORU	Orbital Replacement Unit	CASI
ORUC	ORU Carrier	Goddard
OS	Operating System	Goddard
OSC	Operations Support Center	Goddard
OSC	NASA Office of Space Communications	CASI
OSC	Orbital Sciences Corporation	CASI
OSCAR	Orbiting Satellite Carrying Amateur Radio	CASI
OSCIR	University of Florida Infrared Camera and Spectrometer	Goddard
OSD	Operations Support Directive	Goddard
OSD	Optical Surrogate Detector	Goddard
OSDBU	Office of Small and Disadvantaged Business Utilization	Goddard
OSDR	Operational Sensor Data Record	Goddard
OSE	Operational Support Equipment	CASI
OSEAS	OEX Systems Engineering Support	Langley
OSEMA	Office of Safety, Environmental, and Mission Assurance	Goddard
OSF	Office of Space Flight (NASA HQ)	Goddard
OSF	NASA Office of Space Flight	CASI
OSHA	Occupational Safety and Health Act	Goddard
OSHA	Occupational Safety and Health Administration	Goddard
OSI	Open Systems Interconnection	Goddard
OSIP	Operational Suitability Improvement Program (Aviation)	Langley
OSL	OTA Simulator Built by LAS (Marseilles)	Goddard
OSL	Orbiting Solar Laboratory	CASI
OSM	Office of Safety and Mission Assurance	Goddard
OSM	Optical Selector Mechanism	Goddard
OSMA	Office of Safety and Mission Assurance	Goddard
OSO	Office of Space Operations	Goddard
OSO	Orbiting Solar Observatory	CASI
OSP	Orbital Space Plane	CASI
OSRS	Orbital Structural Reference System	Goddard
OSS	Office of Space Science (NASA)	CASI
OSS	Office of Space Station (NASA)	CASI
OSS1	Office of Space Science 1	CASI
OSSA	Office of Space Science and Applications	CASI
OSSD	NASA Office of Space Systems Development	CASI
OSSE	Observing System Simulation Experiment	CASI
OSSE	Oriented Scintillation Spectrometer Experiment (on GRO)	Goddard
OSSMA	Office of Systems Safety and Mission Assurance	Goddard
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OST	Observational Sequence Table	Goddard
OSTA	NASA Office of Space and Terrestrial Applications (Now OAST)	CASI
OSTDS	Office of Space Tracking and Data Systems	Goddard
OSTP	Office of Science and Technology Policy	CASI
OSU	Optical Stimulation Unit	Goddard
OSU	Oregon State University	Goddard
OSWD	Office of Special Weapons Developments, Fort Bliss, TX	CASI
OTA	Optical Telescope Assembly	Goddard
OTAE	Other Technical Assets Employed	Goddard
OTAS	Optical Telescope Assembly Simulator	Goddard
OTB	Orbiter Timing Buffer (Space Shuttle)	CASI
OTD	Optical Transient Detector	Goddard
OTDA	Office of Tracking and Data Acquisition	CASI
OTDR	Optical Time Domain Reflectometer	Goddard
OTE	Observing Time Estimator	Goddard
OTEF	Operational Test and Evaluation Force, Norfolk, VA	CASI
OTF	Optical Transfer Function	CASI
OTF	Optimum Traffic Frequency	CASI
OTFC	On-the-Fly Calibration	Goddard
OTM	Orbital Transfer Maneuver	Goddard
OTMM	Observatory Thermal Math Model	Goddard
OTS	Orbital Tracking Station	Goddard
OTS	Outer Thermal Shield	Goddard
OTS	Orbit Transfer System	CASI
OTSR	Optimum Track Ship Routing	Langley
OTTER	Oregon Transect Terrestrial Ecosystem Research	Goddard
OTU	Office of Technology Utilization	CASI
OTV	Orbit Transfer Vehicle (Propulsive rocket or stage to supplant IUS and SSUS)	CASI
OUSD	Oakland Unified School District	Goddard
OV	Observatory Verification	Goddard
OV	Orbital Verification	Goddard
OVC	Optimized Valence Configuration (Quantum chemistry)	CASI
OVCS	Outer Vapor Cooled Shield	Goddard
OVNI	(French Acronym for UFO's)	CASI
OVRO	Owens Valley Radio Observatory	Goddard
OWBPA	Older Workers Benefit Protection Act of 1990	Goddard
OWL	Orbiting Wide-angle Light collector	Goddard
OWL	One Way Landers	CASI
OWS	Optical Witness Sample	Goddard
OWS	Orbiting Workshop	CASI
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