List of Figures

Figure 1.1: FGS Interferometric Response (the “S-Curve”)

Figure 1.2: FGSs in the HST Focal Plane (Projected onto the Sky)

Figure 1.3: FGS Star Selector Geometry

Figure 2.1: FGS1r Optical Train Schematic

Figure 2.2: Light Path from Koesters Prisms to the PMTs

Figure 2.3: The Koesters Prism: Constructive
and Destructive Interference.

Figure 2.4: Full Aperture S-Curves of the Original FGSs

Figure 2.5: Improved S-Curves for Original FGSs
when Pupil is in Place

Figure 2.6: FGS1r S-Curves in Full Aperture Across the Pickle

Figure 2.7: FGS1r S-curves

Figure 2.8: FGS1r S-curves 2005

Figure 2.9: Shows the changes in the FGS1r S-curves
resulting from the January 2009 AMA adjustment.

Figure 2.10: FGS Proposal System and Detector Coordinate Frames

Figure 2.11: FGS1r Filter Transmission

Figure 2.12: PMT Efficiency

Figure 3.1:  Comparison: PC Observation v. FGS Observation

Figure 3.2:  Simulated PC Observations v. FGS
Observations of a 70mas Binary

Figure 3.3: Comparison of FGS1r and FGS3 Transfer
Mode Performance

Figure 3.4:  Relative Orbit of the Low-Mass Binary
stem Wolf 1062 AB

Figure 3.5: Mira-type variable with a resolved circumstellar disk

Figure 3.6: Flare Outburst of Proxima Centauri as Observed
with FGS3

Figure 3.7: Triton Occultation of the Star TR180 as Observed
by FGS 3

Figure 4.1: Default FESTIME as a Function of V Magnitude
for F583W FGS1r: NEA as a Function of Magnitude
and FESTIME

Figure 4.2: A Sample Visit Geometry

Figure 4.3: .Binary S-Curves Generated from FGS1r X-Axis Data

Figure 4.4:  FGS1r (F583W) S-Curves: Single and Co-Added

Figure 4.5:  Evolution of S-curve morphology along
the FGS1r Y-axis

Figure 5.1: Overlay of the pointings used for the FGS3
OFAD calibration

Figure 5.2: Overlay of pointings used for the FGS1r OFAD
calibration

Figure 5.3: FGS2 Guide Star Motion at the Onset
of a Day/Night Transition

Figure 5.4: Effects of Jitter on an FGS1r S-Curve (single scan)

Figure 5.5: Temporal Stability: FGS3 v. FGS1r

Figure 6.1: Example 1: Field of View at Special Orientation

Figure 6.2: Example 2: Field of View at Special Orientation

Figure 6.3: Example 3: Trans + Pos Mode Visits

Figure 6.4: Example 4: Trans + Pos Mode Exposures

Figure 7.1:  CALFGSA Common Processing Tasks

Figure 7.2: CALFGSA Transfer Mode Processing Tasks

Figure 7.3:  CALFGSB Position Mode Processing

Figure A.1: Location of IFOV as FGS Acquires a Target

Figure A.2:  Offset of True Null from Sy= 0

Figure A.3: X,Y Position in Detector Space of FGS 3’s
IFOV During WalkDown to FineLock and Subsequent
Tracking of a Star in FineLock

Figure B.1: FGS1r S-Curves: Before and After AMA Adjustment

Figure B.2:  FGS1r S-Curves: First Six Months After
AMA Adjustment

Figure B.3:  FGS1r S-Curves: Second Six Months After
AMA Adjustment

Figure B.4: Optimized FGS1r S-Curves Used
in Angular Resolution Test

Figure B.5: FGS1r Transfer Function: Change
in Angular Separation of a Binary

Figure B.6: FGS1r Transfer Function Amplitude
w/ Binary Separation