Chapter 3:
FGS Science Guide

3.1 The Unique Capabilities of the FGS

3.2 Position Mode: Precision Astrometry

3.3 Transfer Mode: Binary Stars and Extended Objects

3.3.1 Observing Binaries: The FGS vs. HST’s Cameras

3.3.2 Transfer Mode Performance

3.4 Combining FGS Modes: Determining Stellar Masses

3.5 Angular Diameters

3.6 Relative Photometry

3.7 Moving Target Observations

3.8 Summary of FGS Performance

3.9 Special Topics Bibliography

3.9.1 STScI General Publications

3.9.2 Position Mode Observations

3.9.3 Transfer Mode Observations

3.9.4 Miscellaneous Observations

3.9.5 Web Resources