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Figures ix
Figure 1.1: WFPC2 Field­of­View Projected on the Sky ................................................ 2
Figure 2.1: Wide Field Planetary Camera Concept Illustration..................................... 21
Figure 2.2: WFPC2 Optical Configuration .................................................................... 22
Figure 2.3: Cooled Sensor Assembly ........................................................................... 24
Figure 2.4: WFPC2 + OTA System Throughput ........................................................... 25
Figure 3.1: Summary of Normalized Filter Curves ....................................................... 39
Figure 3.2: Ramp Filter Peak Transmission ................................................................. 42
Figure 3.3: Ramp Filter Dimensionless Widths ............................................................ 42
Figure 3.4: FR418N and FR533N Wavelength Mapping.............................................. 46
Figure 3.5: FR680N and FR868N Wavelength Mapping.............................................. 47
Figure 3.6: Polarizer Quads.......................................................................................... 52
Figure 3.7: Polarizer Transmission............................................................................... 53
Figure 3.8: Methane Quad Filter................................................................................... 55
Figure 3.9: Wood's Filters............................................................................................. 56
Figure 3.10: UV Filter Red Leaks ................................................................................. 58
Figure 3.11: Precise CCD Alignments and Primary Aperture Locations ...................... 62
Figure 4.1: MPP Operating Principle ............................................................................ 64
Figure 4.2: Pre­flight DQE Measurements on WFPC2 CCDs ...................................... 66
Figure 4.3: Saturated Stellar Image Showing Horizontal Smearing ............................. 69
Figure 4.4: WFPC2 CCD Flat Field .............................................................................. 71
Figure 4.5: Average Dark Rates vs. CCD Row ............................................................ 72
Figure 4.6: Dark Signal vs. Cosmic Ray Flux ............................................................... 74
Figure 4.7: Histogram of Cosmic Ray Event Sizes....................................................... 76
Figure 4.8: Comparison of Star Images and Cosmic Ray Events ................................ 77
Figure 4.9: Histogram of Cosmic Ray Event Energies ................................................. 78
Figure 4.10: Hot Pixel Histogram.................................................................................. 80
Figure 4.11: Images Illustrating CTE Residual Trail ..................................................... 83
Figure 5.1: PSF Surface Brightness ............................................................................. 86
Figure 5.2: Encircled Energy ........................................................................................ 87
Figure 5.3: Encircled Energy for CCD PC1 .................................................................. 88
Figure 5.4: Encircled Energy for CCD WF3.................................................................. 89
Figure 5.5: PSF Variations with Field Position ­ Aberrations........................................ 95
Figure 5.6: PSF Variations with Field Position ­ Obscuration Shifts............................. 96
Figure 5.7: Measured OTA Focus Position (microns) vs. Time.................................... 97
Figure 5.8: Measured Aperture Correction, V(r) ­ V(r=10 pix) ...................................... 98
Figure 5.9: Large Angle Scattering............................................................................. 100
List of Figures

x Figures
Figure 5.10: Saturated Stellar Image Showing Filter Ghosts ..................................... 101
Figure 5.11: Saturated Stellar Image Showing Field Flattener Ghost on WF2........... 102
Figure 5.12: Integrated Photometry Correction Induced by Camera Distortions ........ 105
Figure 6.1: Giant Elliptical Galaxy .............................................................................. 122
Figure 6.2: Sample Fill­out Form for WFPC2 On­Line Exposure Time Calculator ..... 126
Figure 6.3: Sample Results from WFPC2 ETC ­ Point Source .................................. 127
Figure 6.4: Sample Results on CR­SPLITing from WFPC2 ETC ............................... 127
Figure 6.5: Point Source + Stellar Background Fill­out Form for WFPC2 ETC .......... 130
Figure 6.6: Sample Output from WFPC2 ETC ­ Point Source + Background ............ 131
Figure 6.7: Extended Source Form for WFPC2 ETC ................................................. 133
Figure 6.8: Sample Output from WFPC2 ETC ­ Extended Source............................. 134
Figure 6.9: Point Source Form for WFPC2 ETC ­ Emission Line & LRF.................... 136
Figure 6.10: Sample Output for WFPC2 ETC ­ Emission Line & LRF........................ 137
Figure 6.11: Photometric Monitoring Data for WFPC2 ............................................... 140
Figure 6.12: Throughput for the F170W Filter Following Decontaminations .............. 141
Figure 6.13: Change in Throughput vs. Time ............................................................. 141
Figure 7.1: Example of Scattered Earth Light............................................................. 145
Figure 7.2: Impact of OTA Focus Shift on PSF Subtraction ....................................... 148
Figure 7.3: Bright Object Avoidance Regions Near WFPC2 FOV .............................. 149
Figure 7.4: Example of PC1 ``Direct'' Stray Light Ghost .............................................. 150
Figure 7.5: Example of PC1 ``Diffraction'' Stray Light Ghost ....................................... 151
Figure 7.6: Event Timings During a 60s WFPC2 Exposure ....................................... 153
Figure 7.7: Event Timings During a 100s WFPC2 Exposure ..................................... 153
Figure 7.8: ORIENT Definition, Aperture Positions, and CCD Alignments ................. 161
Figure 7.9: Example of ORIENT and POS TARG Selection ...................................... 163
Figure 7.10: Example of ORIENT and POS TARG Selection .................................... 164
Figure 8.1: F336W­F439W against Johnson U­B....................................................... 173
Figure 8.2: F439W­F555W against Johnson B­V ....................................................... 173
Figure 8.3: F555W­F814W against Johnson V­I C ...................................................... 174
Figure 8.4: F555W­F675W against Johnson V­R C ..................................................... 174
Figure 8.5: F675W­F814W against Cousins R C ­I C .................................................... 175
Figure B.1: Point Source SNR vs. V+AB n for F160BW Filter ..................................... 225
Figure B.2: Point Source SNR vs. V+AB n for F218W Filter........................................ 226
Figure B.3: Point Source SNR vs. V+AB n for F255W Filter........................................ 227
Figure B.4: Point Source SNR vs. V+AB n for F300W Filter........................................ 228
Figure B.5: Point Source SNR vs. V+AB n for F336W Filter........................................ 229
Figure B.6: Point Source SNR vs. V+AB n for F410M Filter ........................................ 230
Figure B.7: Point Source SNR vs. V+AB n for F439W Filter........................................ 231
Figure B.8: Point Source SNR vs. V+AB n for F502N Filter......................................... 232
Figure B.9: Point Source SNR vs. V+AB n for F547M Filter ........................................ 233
Figure B.10: Point Source SNR vs. V+AB n for F555W Filter...................................... 234

Figures xi
Figure B.11: Point Source SNR vs. V+AB n for F606W Filter...................................... 235
Figure B.12: Point Source SNR vs. V+AB n for F675W Filter...................................... 236
Figure B.13: Point Source SNR vs. V+AB n for F702W Filter...................................... 237
Figure B.14: Point Source SNR vs. V+AB n for F814W Filter...................................... 238

xii Figures