Table A.1

Acronyms used in this paper.

Acronym Description

AC ACross-scan (direction)
ADC Analogue-to-Digital Converter
AF Astrometric Field
AGIS Astrometric Global Iterative Solution
AL ALong-scan (direction)
AOCS Attitude and Orbit Control Subsystem
ASD Auxiliary Science Data (VPU)
AVM AVionics Model
BAM Basic Angle Monitor
BP Blue Photometer
CCD Charge-Coupled Device (detector)
CDB Configuration DataBase
CDU Clock Distribution Unit
CPS Chemical Propulsion Subsystem (orbit maintenance)
CTI Charge-Transfer Inefficiency
CU Coordination Unit (in DPAC)
DCS De-compression and Calibration Services
Δ-DOR Delta Differential One-way Range
DIB Diffuse Interstellar Band
DPAC Data Processing and Analysis Consortium
DPC Data Processing Centre
DR1 (Gaia) Data Release 1 (September 2016)
DS (Airbus) Defence and Space
EAR Event Anomaly Report
EIRP Equivalent Isotropic Radiated Power
EO Extended Object
EPSL Ecliptic Poles Scanning Law
ESA European Space Agency
ESAC European Space Astronomy Centre (ESA)
ESO European Southern Observatory
ESOC European Space Operations Centre (ESA)
ESTRACK ESA Tracking Stations Network
E-SVM Electrical SerVice Module
FL First Look
GAIA Global Astrometric Interferometer for Astrophysics (obsolete; now spelled as Gaia)
GBOT Ground-Based Optical Tracking
GMSK Gaussian Minimum Shift Keying
GOST Gaia Observation Scheduling Tool
GSR Global Sphere Reconstruction
ICRF International Celestial Reference Frame
ICRS International Celestial Reference System
IDT Initial Data Treatment
IDU Intermediate Data Update
IGSL Initial Gaia Source List
INPOP Intégrateur Numérique Planétaire de l’Observatoire de Paris (ephemerides)
M2MM M2 Mirror Mechanism (focus)
MDB Main DataBase
MIT MOC Interface Task
MMH Mono-Methyl Hydrazine
MOC Mission Operations Centre (ESOC)
MP Metal-Poor (star)
MPS Micro-Propulsion Subsystem (science mode)
M-SVM Mechanical SerVice Module
NSS Non-Single Star
NTO (di-)Nitrogen TetrOxide
OBMT OnBoard Mission Timeline
OBT OnBoard Time (realised in CDU)
ODAS One-Day Astrometric Solution
OGA-1 First On-Ground Attitude determination (in IDT)
OGA-2 Second (and improved) On-Ground Attitude determination (in ODAS/FL)
PAA Phased-Array Antenna
PDHU Payload Data-Handling Unit
PEM Proximity-Electronics Module (CCD)
PLM PayLoad Module
PO (DPAC) Project Office
PSF Point Spread Function
QSO Quasi-Stellar Object
RAFS Rubidium Atomic Frequency Standard (part of CDU)
RMS Root-Mean-Square
RP Red Photometer
RVS Radial-Velocity Spectrometer
SEA Source Environment Analysis
SED Spectral Energy Distribution
SIF Service Interface Function (VPU)
SM Sky Mapper (detector)
SOC Science Operations Centre (ESAC)
SP Star Packet (VPU)
SSO Solar System Object
TCB Barycentric Coordinate Time
TDI Time-Delayed Integration (CCD)
TMA Three-Mirror Anastigmat (telescope)
TODCOR TwO-Dimensional CORrelation
UTC Coordinated Universal Time
VPA Video Processing Algorithms (run on the VPU)
VPU Video Processing Unit (runs the VPAs)
WFS Wave-Front Sensor
XP Shortcut for BP and/or RP (generic name for Blue and Red Photometer)

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