Space Telescope Science Institute
FGS Data Handbook
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Table of Contents

Fine Guidance SensorData Handbook
Preface
How to Use this Handbook
Handbook Structure
Typographic Conventions
Visual Cues
Comments
Chapter 1: Instrument Overview
1.1 Instrument Capabilities
1.1.1 The FGS as a Science Instrument
1.2 Technical Overview
1.2.1 The Instrument
1.2.2 Modes of Operation
1.2.3 FGS Capabilities
1.2.4 FGS Control
1.3 Target Acquisition and Tracking
1.3.1 Search
1.3.2 CoarseTrack
1.3.3 FineLock
1.3.4 Transfer Scans
1.4 FGS Guiding
Chapter 2: FGS Data Products
2.1 Engineering Telemetry Data
2.1.1 File Description
2.1.2 Group Structure and Group Contents
2.1.3 FITS Header Keywords
2.2 Relationship to Phase II Proposal
2.3 Jitter Files
2.4 SMS Support Data
Chapter 3: Calibration
3.1 Preparing FGS Data for Processing
3.2 Initial Data Processing - calfgsa
3.2.1 calfgsa and Transfer Mode Data
3.2.2 calfgsa and Position Mode
3.3 calfgsa Processing Overview
3.4 calfgsb and Position Mode
3.4.1 preparing to use calfgsb
3.4.2 executing calfgsb
3.5 Position Mode Processing Overview
3.5.1 Processing Individual Observations
3.5.2 Visit level processing
3.6 calfgsa Output: The *.tab File
Chapter 4: Data Analysis
4.1 Analysis Tools
4.2 Analyzing Individual Observations
4.2.1 FGSPLOT
4.2.2 Read-FGS
4.2.3 Export-FGS
4.3 Analyzing Multi-Epoch Astrometry Data: gaussfit
4.3.1 4 and 6 Parameter Plate Solutions
4.3.2 Preparing Files for input by Gaussfit
4.4 Transfer Mode Data Analysis
4.4.1 Transfer Mode Data Reduction
4.4.2 Analyzing Observations of Binary Stars
4.5 Uncertainties in Transfer Mode Data
Chapter 5: Astrometric Error Sources
5.1 Levels of Position Mode Errors
5.2 Observation-Level Position Mode Errors
5.2.1 Rotation Angle Errors
5.2.2 Centroiding Errors
5.2.3 Locating Interferometric Null
5.2.4 Optical Field Angle Distortion
5.2.5 Lateral Color Error
5.2.6 Cross Filter Effect
5.2.7 Differential Velocity Aberration
5.2.8 Lever Arm Length and Offset Angle
5.3 Visit-Level Position Mode Errors
5.3.1 Position Mode De-jittering Errors
5.3.2 Drift Correction Errors
5.4 Field-Level Position Mode Errors
5.5 Transfer Mode Errors

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