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James Webb Space Telescope
STScI Logo

James Webb Space Telescope
Glossary & Acronym List

mm Millimeter
mas milli-arc second
mW Milliwatt
m Meter
kg Kilogram(s)
bps bits per second
ZOE Zone of Exclusion
XTE X-ray Timing Explorer
XDL Cross-Delay Line
WU Work Unit
WMAP Wilkinson Microwave Anisotropy Probe
WLI White-Light Interferometry
WFSC Wavefront Sensing & Control
WFS&C Wavefront Sensing and Control
WFS Wavefront Sensor
WFPC2 Wide Field and Planetary Camera 2
WFPC Wide Field Planetary Camera
WFE Wavefront Error
WFC3 Wide-Field Camera 3
WFC Wide Field Channel (for ACS)
WF/PC Wide Field and Planetary Camera
WF Wide Field
WF Wavefront
WETF Weightless Environment Training Facility
WCA Wavelength Calibration Aperture
WBS Work Breakdown Structure
WAG Wild-Ass Guess
VTT Visual Target Tuner
VSS Vehicle Support Software
VLA Very Large Array
VEST Vehicle Electrical System Test
VE Valid Event
VDD Version Description Document
VDC Volts Direct Current
VCRM Verification Cross Reference Matrix
V Volts
UVM Unix Version Management
UV Ultraviolet
UTC Universal Time Coordinated
USN Universal Space Network
URL Uniform Resource Locator
UR University of Rochester
UPS User Planning System
UML Unified Modeling Language
UKST-IR United Kingdom Schmidt Telescope IR survey
UKST United Kingdom Schmidt Telescope
UKIRT United Kingdom Infrared Facility
UDL Unique Data Log
UDF Ultra Deep Field
TV Thermal Vacuum
TTRB Telescope Time Review Board
TSS Thermal Synthesizer System
TSD Trade Studies Document
TRR Test Readiness Review
TRL Technical Readiness Level
TRD Test Results Document
TRANS Transformation
TPS Total Pressure Sensor
TPM Technical Performance Measurement
TPG Timing Pattern Generator
TPF Terrestrial Planet Finder
TOO Target Of Opportunity
TMP Technical Management Plan
TMG Thermal Model Generator
TMA Three-mirror Anastigmat
TM Technical Memorandum
TLRD Top Level Review Dates
TLM Telemetry
TJD Truncated Julian Date
TIR Thermal Infrared
TIR Technical Instrument Report
TIPS Telescope and Instruments Performance Summary
TIM Timing Interface Module
THV Threshold Voltage
TFST Target Field Simulation Testbed
TF Tunable Filter
TEC Thermo-Electric Cooler
TDRSS Tracking and Data Relay Satellite System
TDF Take Data Flag
TDC Time-to-Digital Converter
TCP/IP Transmission Control Protocol/Internet Protocol
TBS To Be Specified
TBR To Be Resolved
TBD To Be Determined
TB Terra Bytes
TAC Time Allocation Committee
TAACOS Target Acquisition Analysis for COS
TA Target Alignment
TA Target Acquisition
T&DF Trigger and Dataflow
SWG Science Working Group
SVS Scheduling & Verification System
SUSD Science User Systems Department
STT Software Testing Team
STScI Space Telescope Science Institute
STSDAS Space Telescope Science Data Analysis System
STS Space Transportation System
STR Space Telescope Requirements
STR Science Tape Recorder
STP System Test Plan
STOCC Space Telescope Operations Control Center
STIS Space Telescope Imaging Spectrograph
STIC Space Telescope Institute Council
STEP Standard for the Exchange of Product Model Data
STEIS Space Telescope Electronic Information System
STDN Spaceflight Tracking and Data Network
STD Standard
STAC Space Telescope Advisory Council
ST Star Tracker
SSRR Subsystem Requirements Review
SSR System Specification Review
SSR Solid-State Recorder
SSM Spacecraft Support Module
SSG Science Software Group
SSCT Spacecraft Scheduling & Commanding Team
SSC Science Support Center
SSAC Senior Science Advisory Committee
SSA Single Service Access
SS Sun Sensor
SRR System Requirements Review
SRD System Requirements Document
SQL Structured Query Language
SPSS Science Planning & Scheduling System
SPSO Science Program Selection Office
SPIKE Science Planning In a Knowledge Environment
SPC Stored Program Command
SPA Solar Panel Assembly
SOW Statement of Work
SOH State of Health
SOGS Science Operations Ground System
SOFIA Stratospheric Observatory for Infrared Astronomy
SOFA Selectable Optical Filter Array
SOC Science Oversight Committee
SOC Science Operations Center
SNR Signal to Noise Ratio
SN Supernova
SMU Safemode Utility
SMS Science Mission Schedule
SMOV Servicing Mission Orbital Verification
SMOC Science Management and Operations Contract
SMIT Servicing Mission Integrated Timeline
SMGT Servicing Mission Ground Test
SM4 Servicing Mission Four
SM Secondary Mirror
SLT Senior Leadership Team
SITS Science Instrument Test System
SISD Science Instrument Support Department
SIRTF Space Infrared Telescope Facility
SIPE Science Instrument Protective Enclosure
SIP SOGS Invokable Procedure
SINDA Systems Improved Numerical Differencing Analyzer and Fluid Integrator
SIM Space Interferometry Mission
SIFT Systems Infrastructure Team
SICS Science Instrument Corrected System
SIAF Science Instrument Aperture File
SI Science Instrument
SHP Standard Header Packet
SGS SOGS/SPSS Graphical Scheduler
SGMD Subscale Beryllium Mirror Demonstrator
SFR Star Forming Region
SEU Single Event Upset
SET Systems Engineering Team
SERC-J/EJ Science and Engineering Research Council J/EJ surveys
SERC Science and Engineering Research Council
SER Systems Engineering Report
SEMP Systems Engineering Management Plan
SEM Space Environment Monitor
SEL Software Engineering Laboratory
SECM Systems Engineering Capability Model
SEB Systems Engineering Board
SEB Source Equivalent Board
SEA Scientist's Expert Assistant
SDT Scheduling Development Team
SDSS Sloan Digital Sky Survey
SDR System Design Review
SDR System Definition Review
SDP Standard Data Packet
SDN Software Delivery Notice
SDI Science Data Image
SDF Science Data Formatter
SDD System Design Document
SCS Science Commanding System
SCR System Concept Review
SCR Software Change Request
SCPS-FP Space Communications Protocol Specification - File Protocol
SCA Sensor Chip Assembly
SBC Solar Blind Channel (for ACS)
SAS Science Analysis Software
SAOP Semi-Annual Operating Plan
SAM Small Angle Maneuver
SAGA Solar Array Gain Augmentation
SADE Solar Array Drive Electronics
SAC Special Action Code
SAC Solar Array Carrier
SAA South Atlantic Anomaly
S/W SoftWare
S/N Signal-to-Noise ratio
S/C Spacecraft
S/C Spacecraft
Root Mean Square The square root of the average of the squares of a set of numbers.
RWA Reaction Wheel Assembly
RW Reaction Wheel
RVMM Rear View Mirror Mode
RTI Real-Time Interrupt
RTCS Relative-Time Command Sequence
RT Reference Telescope
RT Real Time
RSU Rate Sensor Unit
RSS Root Sum Square
RS Reed-Solomon
RPS2 Remote Proposal Submission System Two
RON Readout Noise
ROM Read Only Memory
RMS Root Mean Square
RMP Risk Management Plan
RMGA Retrieval Mode Gyro Assembly
RIU Remote Interface Unit
RID Review Item Discrepancy
RIAF Radial Image Alignment Facility
RGA Rate Gyro Assembly
RFP Request for Proposal
RFO Request for Offer
RFI Radio Frequency Interference
RFA Request for Action
RF Radio Frequency
REE Remote Exploration and Experimentation
RDBS Relational Database System
RCS Revision Control System
RCS Reaction Control System
RCR Requirements Change Request
RCP Refractive Corrector Plate
RAS Refractive Aberration Simulator
R&D Research & Development
QUACK Quality Acknowledgment
QLD Quick-Look Data
QFM Quadrature Mirror Filter
QE Quantum Efficiency
Pixel Picture element; the smallest discrete component of an image.
PSS Planning & Scheduling Subsystem
PSF Point Spread Function
PSEA Pointing & Safing Electronics Assembly
PSE Power System Electronics
PSD Planning & Scheduling Systems Department
PSA Primary Science Aperture
PS Project Specification
PRD Project Reference Database
PRA Probabilistic Risk Assessment
PR Procurement Request
PPT Proposal & Planning Tools
PPM Process Performance Measure
PPD Project Planning Document
PPAR Preliminary Project Approval Review
POSS-II Palomar Observatory Sky Survey II
POSS Palomar Observatory Sky Survey
PORTS Payload Operations Real-Time System
POR Power-On Reset
POP Program Operating Plan
POM Pick-Off Mirror
POD Packetized Observation Datax
POCC Payload Operations Control Center
PNS Project Need Statement
PNAR Preliminary Non-Advocate Review
PN Pseudo-Noise
PMR Program Management Review
PMO Program Management Office
PMDB Proposal Management DataNbase
PM Program Management
PM Primary Mirror
PLCP Planning Command Pool
PL Payload
PIT Processor Interface Table
PID Proportional-Integral-Derivative
PI Principal Investigator
PHD Pulse Height Distribution
PHA Pulse Height Analysis
PGS Proposal Generation Subsystem
PFU Protoflight Unit
PFR Problem/Failure Report
PF PathFinder
PERL Practical Extraction and Report Language
PDU Power Distribution Unit
PDT Planning Development Team
PDR Preliminary Design Review
PDF Portable Document Format
PDD Project Description Document
PDB Project Database
PCU Power Control Unit
PCS Pointing Control System
PCF Piecewise Constant Function
PC Planetary Camera
PC Photocathode
PC Personal Computer
PASS POCC Applications Software Support
PASP Publications of the Astronomical Society of the Pacific
PAPL Program Approved Product List
PAO Public Affairs Office
PAIP Product Assurance Implementation Plan
PA Position Angle
Observation Plan Executive The process control system on the spacecraft which will coordinate execution of the observation plan with execution of autonomous spacecraft activities.
OTE Optical Telescope Element
OTA Optical Telescope Assembly
OSS Office of Space Science
OSM Optics Select Mechanism
OSF Observation Summary Form
OSCF Observations Support Computing Facility
OS Optical Stimulus
OS Operating System
ORU Orbital Replacement Unit
ORR Operations Readiness Review
ORI Orbital Replacement Instrument
OPUS Operational Pipeline Unified Systems
OPS OPerationS
OPR Operations Problem Report
OPO Office of Public Outreach
OPE Observation Plan Executive
OPD Optical Path Difference
OP Observation Plan
OMS Observation Monitoring System
OLD Operations Limitations Document
OGSE Optical Ground Support Equipment
OFAD Optical Field Angle Distortion
OERB Origins External Review Board
ODB Operational Database
OCD Operations Concept Document
OBOSS On Board Operations Support Software
OBDM On Board Data Management
OBA Optical Bench Assembly
OAR Operations Acceptance Review
NVO National Virtual Observatory
NUV Near Ultraviolet
NTP Network Time Protocol
NSSC-1 NASA Standard Spacecraft Computer -- Model 1
NSG New Starts Group
NSF National Science Foundation
NRA NASA Research Announcement
NPG NASA Procedures and Guidelines
NOAO National Optical Astronomy Observatories
NMSD Next generation Mirror System Demonstrator
NMS NGST Mission Simulator
NJy nanoJansky
NIST National Institute of Standards and Technology
NISD New Instruments and Servicing Department
NIRSPEC Near Infrared Spectrometer
NIRCAM Near Infrared Camera
NIR Near Infrared
NIP New Initiatives panel
NICMOS Near Infrared Camera and Multi-Object Spectrometer
NGSTP NGST Project Office
NGST Mission Simulator The NGST Mission Simulator (NMS) can be used to calculate exposure times or sensitivities for observations of astronomical targets for a specific design of the NGST observatory and science instruments. The NMS can also be used to calculate the Mission Elapsed Time (MET) for a suite of observing programs, by optimally scheduling those observations and taking into account the associated overheads.
NGST Next Generation Space Telescope
NGSS New Guide Star System
NGP North Galactic Pole
NEAR Near Earth Asteroid Rendezvous
NEA Noise Equivalent Angle
NDI Non-Developmental Item
NDF NGST Discretionary Fund
NDC/TFST NGST Detector Characterization project/Target Field Simulation Testbed
NDC NGST Detector Characterization project
NCS NICMOS Cooling System
NCC Network Control Center
NBS Neutral Buoyancy Simulator
NASTRAN NASA Structural Analysis
NASCOM NASA Communications
NASA National Aeronautics and Space Administration
N*M*S Newton*meter*second
N*M Newton*meter
MeV Mega electron Volt
MUX Multiplexing Amplifier
MTS Magnetic Torquer System
MTL MIRI Technical Lead
MTF Modulation Transfer Function
MSS Magnetic Sensing System
MSFC Marshall Space Flight Center
MSA Micro-Shutter Array
MPP Multi-Pinned Phase
MOU Memorandum of Understanding
MOSS Moving Object Selection System
MOSES Mission Operations, Systems Engineering, and Software
MOS Multi-Object Spectrograph
MOR Mission Operations Room
MOR Mission Operations Review
MOP Meta-Object Protocol
MOCD Mission Operations Concept Document
MLI Multi-Layer Insulation
MISC Mid Infrared Steering Committee
MIRSPEC Mid Infrared Spectrometer
MIRI Mid Infrared Instrument
MIRCAM Mid Infrared Camera
MIR Mid Infrared
MIPS Million Instructions Per Second
MIP Machine-Independent Path
MIME Multipurpose Internet Mail Extensions
MIB Mishap Investigation Board
MGSE Mechanical Ground Support Equipment
MFED Mission & Flight Engineering Department
MET Mission Elapsed Time
MEMS Micro-Electro-Mechanical Systems
MEM micro-electro-mechanical
MEB Main Electronics Box
MDS Mission Data System
MDR Mission Definition Review
MCU Mechanisms Control Unit
MCP Microchannel Plate
MCE MAMA Control Electronics
MC Mission Control
MB Megabyte
MAST Multi-Mission Archive at Space Telescope
MARS Membrane with Active Rigid Support
MAR Macro Activation Request
MAP Microwave Ansiotropy Probe
MAMA Multi-Anode Multichannel (or Micro-channel) Array
MA Multiple Access
LVPS Low Voltage Power Supply
LVPC Low Voltage Power Converter
LRS Low-Resolution Spectrograph
LRP Long Range Plan
LP Low Pass (filter)
LOS Loss Of Signal
LOS Line of Sight
LLD Lessons Learned Document
LGA Low Gain Antenna
LEO Low Earth Orbit
L2 Sun-Earth Lagrange Point 2
L&EO Launch and Early Orbit
KeV Kilo electron Volt
KSC Kennedy Space Center
KBO Kuiper Belt Object
K Kelvin
JWST James Webb Space Telescope
JPL Jet Propulsion Laboratory
JOFOC Justification for Other than Full and Open Competition
InSb Indium Antimonide
IVT Interface Verification Test
IVC Institute Visiting Committee
IV&V Independent Validation and Verification
IUE International Ultraviolet Explorer
ITTT Infra-red Telescope Technology Testbed
ITOC Integration and Test Operations Center
ITE Integrated Test Environment
ISWG Interim Science Working Group
ISR Instrument Science Report
ISO Infrared Space Observatory
ISM Interstellar Medium
ISIM Integrated Science Instrument Module
ISC Information System Center
IRU Inertial Reference Unit
IRS Interface Requirements Specification
IRN Interface Revision Notice
IRD Interface Requirements Document
IRAS Infrared Astronomy Satellite
IRAF Image Reduction & Analysis Facility
IR Infra Red
IPT Integrated Product Team
IP Integration Plan
IMAP Internet Message Access Protocol
IM Instruction Management
IGM Intergalactic Medium
IFU Integral Field Unit
IEC ISIM Electronics Compartment
IDTL Independent Detector Testing Laboratory
IDT Investigation Definition Team (or Instrument Development Team)
IDT Integrated Development Team
IDT Image Dissector Tube
IDN Intent to Deliver Notice
IDM Intelligent Database Machine
IDL Interactive Data Language
IDD Interface Design Document
ID Identification
ICWG Interface Control Working Group
ICE Instrument Control Electronics
ICD Interface Control Document
ICAL Image Calibration Group
IBC Impurity Band Conduction
I/O Input/Output
I/F Interface
I&T Integration & Testing
Hz Hertz
HgCdTe Mercury-Cadmium-Telluride
HVPS High Voltage Power Supply
HVFM High Voltage Filter Module
HV High Voltage
HTTP Hypertext Transfer Protocol
HSTAR Hubble Space Telescope Anomaly Report
HST Hubble Space Telescope
HSP High Speed Photometer
HRC High Resolution Channel (for ACS)
HQ HeadQuarters
HOPR Hubble Observation Problem Report
HGA High Gain Antenna
HDU Header Data Unit
HDF-S Hubble Deep Field South
HDF Hubble Deep Field
HDA Hubble Data Archive
H&S Health and Safety
Gbit Giga bits
GTO Guaranteed Time Observer
GSTS Ground Station System
GST Ground System Team
GSS Guide Star Selection Subsystem
GSFC Goddard Space Flight Center
GSE Ground Support Equipment
GSD Ground Systems Department
GSC-II Guide Star Catalog II
GSC-2 Guide Star Catalog 2
GSC Guide Star Catalog
GS Guide Star
GS Ground Station
GS Ground Segment
GROVER GRating Optical Verification Equipment-Reflective
GPO Government Printing Office
GPG GSFC Procedures and Guidelines
GOTS Government Off-The-Shelf
GOODS Great Observatories Origins Deep Survey
GOES Geosynchronous Operational Environmental Satellites
GO Guest Observer (or General Observer)
GN Ground Network
GMS Grants Management Subsystem
GMP Greenwich Mean Time
GIMP Geomagnetic Induced Magnetic Problem
GHRS Goddard High Resolution Spectrograph
GFE Government Furnished Equipment
GEVS-SE GEVS for STS and ELV payloads
GEVS General Environmental Vehicle Specification
GEOS Geosynchronous Operational Environmental Satellites
GCS Ground Communications Subnet
GB GigaByte
GASP GSSS Astrometric Support Package
GALEX Galaxy Evolution Explorer
G-S Gerchberg-Saxton
FWHM Full Width at Half Maximum
FUV Far Ultraviolet
FUV Far Ultra-Violet
FUSE Far Ultraviolet Spectroscopic Explorer
FTP File Transfer Protocol
FTE Full-Time Equivalent
FTA Fault Tree Analysis
FSWG Flight Science Working Group
FSW Flight Software
FSM Fast Steering Mirror
FRSS FHST Reference Star System
FRR Flight Readiness Review
FRB Failure Review Board
FQT Final Qualification Test
FPGA Field-Programmable Gate Array
FPE Focal Plane Electronics
FPAP Focal Plane Assembly Processor
FPA Focal Plane Assembly
FPA Focal Plane Array
FOV Field of View
FOT Flight Operations Team
FOS Flight Operations System
FOS Faint Object Spectrograph
FOR Field of Regard
FOC Faint Object Camera
FMEA Failure Modes and Effects Analysis
FITS Flexible Image Transport System
FIG Front-End Implementation Group
FHST Fixed Head Star Tracker
FGS Fine Guidance Sensor
FES Fine Error Signal
FEMAP Finite Element Modeling and Post-processing
FEC Fast Event Counter
FDSS Flight Dynamics Support System
FDSS Flight Data System Software
FDF Flight Dynamics Facility
FCA Flat-field Calibration Aperture
FAR Federal Acquisition Regulation
F&I Flags & Indicators
EZW Embedded Zerotree Wavelet
EVMS Earned Value Management System
EVD Engine Valve Driver
EVA Extra-Vehicular Activity
EUVE Extreme Ultraviolet Explorer
ETR Engineering Tape Recorder
ETC Exposure Time Calculator
ET Engineering Team
ESS Engineering & Software Services
ESO European Southern Observatory
ESD Electrostatic Discharge
ESA European Space Agency
ERO Early Release Observation
ER Engineering Report
EPS Electrical Power Subsystem
EPF Extended Payload Fairing
EOS Earth Observation System
EOL End of Life
EMI Electromagnetic Interference
EMC Electromagnetic Compatibility
ELV Expendable Launch Vehicle
EGSE Electrical Ground Support Equipment
EELV Evolved Expendable Launch Vehicle
EEE Electrical, Electronic, and Electromechanical
EDPS Engineering Data Processing and Archive System
ECU Electronics Control Unit
ECF European Coordinating Facility
DWT Discrete Wavelet Transform
DVD Digital Video Disk
DVA Detector Vacuum Assembly
DSS Digital Sky Survey
DSN Deep Space Network
DRM Design Reference Mission
DRD Data Requirements Document
DQE Detector Quantum Efficiency
DPT Data Processing Team
DPR Direct Pixel Readout
DOTA Deployable Optical Test Assembly
DOORS Dynamic Object-Oriented Requirements System
DOF Degree Of Freedom
DOD Depth of Discharge
DOC Distributed Object Controller
DOC Director's Oversight Committee
DOB Deployable Optical Bench
DN Digital Number
DMS Data Management System
DMO Document Management Officer
DMF Data Management Facility
DMA Direct Memory Access
DM Deformable Mirror
DIU Data Interface Unit
DIRBE Diffuse Infrared Background Experiment
DIL Deliverable Item List
DIB Detector Interface Board
DHS Dispersed Hartmann Sensing
DFS Dispersed Fringe Sensor
DF224 Onboard computer for engineering operations
DET Direct Energy Transfer
DENIS DEep Near-Infrared Survey
DEB Detector Electronics Box
DDT Database Developer Team
DCR Document Change Request
DCN Document Change Notice
DCL Detector Characterization Laboratory
DCF Data Capture Facility
DCE Dewar Control Electronics
DCE DDL Control Electronics
DCATT Developmental Cryogenic Active Telescope Testbed
DADS Data Archive and Distribution Service
Correlated Double Sample The read noise that results when the minimum number of reads of the detector are done, one before the integration & one after the integration. It is the square root of two larger than the read read noise of a single read.
Charge-Coupled Device A solid-state light-detecting device.
CXC Chandra X-Ray Center
CWIC Constant-rate Wavelet-based Image Compressor
CVZ Continuous Viewing Zone
CVS Concurrent Version System
CTS Command and Telemetry System
CTP Command and Telemetry Processor
CTIO Cerro Tololo Interamerican Observatory
CTI Charge Transfer Inefficiency
CTE Coefficient of Thermal Expansion
CTE Charge Transfer Efficiency
CSS Coarse Sun Sensor
CSP Constraint Satisfaction Problem
CSM Channel Select Mechanism
CSCI Computer Software Configuration Item
CSA Canadian Space Agency
CSA Canadian Space Agency
CRR Cosmic Ray Removal
CRR Component Requirements Review
CRD Component Requirements Document
CRC Cyclic Redundancy Check
CRB Change Review Board
CR Cosmic Ray
CR Change Request
CPU Central Processing Unit
CPI Continuous Process Improvement
CPCI Compact Peripheral Component Interconnect
COTS Commercial Off-The-Shelf
COTR Contracting Officer Technical Representative
COSTAR Corrective Optics Space Telescope Axial Replacement
COS Cosmic Origins Spectrograph
CORBA Common Object Request Broker Architecture
COP-1 Command Operations Procedure 1
COP Command Operations Protocol
COMPASS Catalog of Objects and Measured Parameters from All Sky Surveys
COMCON Communications Contact
CO Contracting Officer
CMS Code Management System
CMP Configuration Management Plan
CMO Configuration Management Office
CMO Community Missions Office
CMI Covariance Matrix Inversion
CMD Commanding Team
CM Center of Mass
CLD Command Language Directive
CI Configuration Item
CG Center of Gravity
CFDP Coherent File Distribution Protocol
CEU Computer Enhancement Unit
CEI Contract End-Item
CEB CCD Electronics Box
CDS Correlated Double Sample
CDRL Contract Data Requirements List
CDR Critical Design Review
CDH Command & Data Handling
CDFS Chandra Deep Field South
CDD Component Design Document
CCSDS Consultative Committee for Space Data Systems
CCS Control Center System
CCR Configuration Change Request
CCD Charge-Coupled Device
CCB Configuration Control Board
CASA Center for Astrophysics and Space Astronomy
CARD Constraint And Restriction Document
CAD Computer-Aided Design
C&DH Command and Data Handling
C&C Candidate & Calendar
C Centigrade
BRDF Bidirectional Reflectance Distribution Function
BP Bandpass
BOP Bright Object Protection
BOL Beginning of Life
BOA Bright Object Aperture
BER Bit Error Rate
BATC Ball Aerospace and Technology Corporation
B&P Bid & Proposal
Astronomical Unit The mean distance from Earth to the Sun, approximately 1.5 x 10^8 km
AURA Associated Universities for Research in Astronomy
AU Astronomical Unit
AT Archive Team
ASWG Ad hoc Science Working Group
ASIC Application Specific Integrated Circuit
ASCS Aft Shroud Cooling System
ASC Autonomous Shutdown Counter
AR Archival Research
APT Astronomer's Proposal Tool
APO Advanced Programs Office
AP Application Processor
AOS Acquisition of Signal
AOC Attitude/Orbit Control
AO Announcement of Opportunity
AO Adaptive Optics
AMSD Advanced Mirror System Demonstrator
AIT Assembly, Integration and Test
AI&T Assembly, Integration & Testing
AHPS Astigmatic Height for Point Source
AGN Active Galactic Nuclei
AFP Aperture Focal Plane
AFM Actuated Fold Mirror
AEDP Astrometry Engineering Data Processor
ADS Astrophysics Data System
ADM Administration
ADC Analog to Digital Converter
ADASS Astronomical Data Analysis Software and Systems
AD Activity Description
ACS Attitude Control System
ACS Aperture Coordinate System
ACS Advanced Camera for Surveys
ACQ ACQuisition
ACF Absolute Constraint Function
AC AutoCollimating
AAO-SES Anglo Australian Observatory Second Epoch Sky Survey
A/D Analog-to-Digital
2MASS Two Micron All Sky Survey