Table of Contents Acknowledgments Chapter 1: Introduction Purpose Instrument Handbook Layout The FGS as a Science Instrument Technical Overview The Instrument Spectral Response The S-Curve: The FGS's Interferogram FGS1r and the AMA Field of View Modes of Operation Planning and Analyzing FGS Observations Writing an FGS Proposal Data Reduction FGS2r HST's 2nd Replacement FGS Chapter 2: FGS Instrument Design The Optical Train The Star Selectors The Interferometer FGS Detectors HST's Spherical Aberration The FGS Interferometric Response The Ideal S-Curve Actual S-Curves The FGS1r Articulated Mirror Assembly FGS Aperture and Filters FOV and Detector Coordinates Filters and Spectral Coverage FGS Calibrations Chapter 3: FGS Science Guide The Unique Capabilities of the FGS Position Mode: Precision Astrometry Transfer Mode: Binary Stars and Extended Objects Observing Binaries: The FGS vs. WFPC2 Transfer Mode Performance Combining FGS Modes: Determining Stellar Masses Angular Diameters Relative Photometry Moving Target Observations Summary of FGS Performance Special Topics Bibliography STScI General Publications Position Mode Observations Transfer Mode Observations Miscellaneous Observations Web Resources Chapter 4: Observing with the FGS Position Mode Overview The Position Mode Visit The Position Mode Exposure Planning Position Mode Observations Target Selection Criteria Filters Background Position Mode Exposure Time Calculations Exposure Strategies for Special Cases Sources Against a Bright Background Crowded Field Sources Position Mode Observing Strategies Summary of Position Mode Error Sources Drift and Exposure Sequencing Cross Filter Observations Transfer Mode Overview The FGS Response to a Binary The Transfer Mode Exposure Planning a Transfer Mode Observation Target Selection Criteria Transfer Mode Filter and Color Effects Signal-to-Noise Transfer Mode Exposure Time Calculations Transfer Mode Observing Strategies Summary of Transfer Mode Error Sources Drift Correction Temporal Variability of the S-Curve Faint Targets and Background Subtraction Empirical Roll Angle Determination Exposure Strategies for Special Cases: Moving Targets Chapter 5: FGS Calibration Program Position Mode Calibrations and Error Sources Position Mode Exposure Level Calibrations Position Mode Visit Level Calibrations Position Mode Epoch-Level Calibrations Transfer Mode Calibrations and Error Sources Linking Transfer and Position Mode Observations Cycle 10 Calibration and Monitoring Program Active FGS1r Calibration and Monitoring Programs Special Calibrations Chapter 6: Writing a Phase II Proposal Phase II Proposals: Introduction Required Information STScI Resources for Phase II Proposal Preparation Instrument Configuration Optional Parameters for FGS Exposures Special Requirements Visit-Level Special Requirements Exposure-Level Special Requirements Overheads Position Mode Overheads Transfer Mode Overhead Proposal Logsheet Examples 1. Parallax Program with Position Mode 2. Bright Binary with Transfer Mode 3. Mass Determination: Transfer and Position Mode 4. Faint Binary with Transfer Mode: Special Background and Roll Angle Measurements Chapter 7: FGS Astrometry Data Processing Data Processing Overview Exposure-Level Processing Initial Pipeline Processing Observing Mode Dependent Processing Visit-Level Processing Position Mode Transfer Mode Epoch-Level Processing Parallax, Proper Motion, and Reflex Motion Binary Stars and Orbital Elements Appendix 1: Target Acquisition and Tracking FGS Control Target Acquisition and Position Mode Tracking Slew to the Target Search CoarseTrack FineLock Transfer Mode Acquisition and Scanning Visit Level Control Appendix 2: FGS1r Performance Summary FGS1r's First Three Years in Orbit Angular Resolution Test Test Results: The Data Test Results: Binary Star Analysis FGS1r's Angular Resolution: Conclusions FGS1r: Final AMA Adjustment Glossary of Terms List of Figures List of Tables Index
