STScI

WFPC2 Instrument Handbook for Cycle 11

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Table of Contents


Acknowledgments

Chapter 1: Introduction

Instrument Overview
Field-of-View
Spectral Filters
Quantum Efficiency and Exposure Limits
CCD Detector Technology
UV Imaging
Aberration Correction and Optical Alignment
Which Instrument to Use: WFPC2, ACS, NICMOS, or STIS?
Comparison of WFPC2 and ACS
Comparison of WFPC2 and NICMOS
Comparison of WFPC2 and STIS
History of WFPC2
The Previous vs. Current Generation: WF/PC-1 vs. WFPC2
Organization of this Handbook
What's New in Version 5.0 for Cycle 10
What's New in Version 6.0 for Cycle 11
WFPC2 Handbook on the WWW
The Help Desk at STScI
Further Information

Chapter 2: Instrument Description

Science Objectives
WFPC2 Configuration, Field-of-View, and Resolution
Overall Instrument Description
Quantum Efficiency
Shutter
Serial Clocks
Overhead Times
CCD Orientation and Readout
Calibration Channel

Chapter 3: Optical Filters

Introduction
Choice of Broad Band Filters
Linear Ramp Filters
Spectral Response
Target Locations
LRF Photometric Calibration
Redshifted [OII] Quad Filters
Polarizer Quad Filter
Polarization Calibration
Methane Quad Filter
Wood's Filters
Red Leaks in UV Filters
Apertures

Chapter 4: CCD Performance

Introduction
Quantum Efficiency
Dynamic Range
Bright Object Artifacts
Blooming
Horizontal Smearing
Diffraction Effects and Ghost Images
Residual Image
Quantum Efficiency Hysteresis
Flat Field Response
Dark Backgrounds
Sources of Dark Current
Darktime
Dark Current Evolution
Cosmic Rays
SAA and Scheduling System Changes
Radiation Damage and Hot Pixels
Photometric Anomalies: CTE and Long vs. Short
Charge Transfer Efficiency
The Long vs. Short Photometric Anomaly
Read Noise and Gain Settings

Chapter 5: Point Spread Function

Effects of OTA Spherical Aberration
Aberration Correction
Wavefront Quality
CCD Pixel Response Function
Model PSFs
PSF Variations with Field Position
Aperture Corrections vs. Field Position
PSF Variations with Time / OTA Focus
PSF Anomaly in F1042M Filter
Large Angle Scattering
Ghost Images
Optical Distortion

Chapter 6: System Throughput and SNR / Exposure Time Estimation

System Throughput
On-Line Exposure Time Calculator
Target Count Rates
Count Rates for Stellar Sources
Count Rates for Power Law Sources
Count Rates for Emission Line Sources
Sky Background
Signal-to-Noise Ratio Estimation
Point Sources -- PSF Fitting
Point Sources -- Aperture Photometry
Extended Sources
Exposure Time Estimation
Sample SNR Calculations
Point Sources
Extended Sources
Emission Line Sources
Photometric Anomalies
Red Leaks in UV Filters
Long-term Photometric Stability
Short-term Time Dependence of UV Response

Chapter 7: Observation Strategies

Observing Faint Targets
Observing Bright Targets
Observing Faint Targets Near Bright Objects
Cosmic Rays
Choosing Exposure Times
Dithering with WFPC2
Dither Strategies
Analysis of Dithered Data
Pointing Accuracy
Absolute Pointing Accuracy
Updates to Aperture / Coordinate Systems
Pointing Repeatability
Tracking Modes
CCD Position and Orientation on Sky
Software to Aid ORIENT Selection
ORIENT Anomaly
Polarization Observations
Observing with Linear Ramp Filters
Emission Line Observations of Galaxy Nuclei

Chapter 8: Calibration and Data Reduction

Calibration Observations and Reference Data
Flat Fields
Dark Frames
Bias Frames
Data Products and Data Reduction
Pipeline Processing
On-The-Fly Reprocessing Systems
Fluxes and Standard Magnitudes
Color Transformations of Primary Filters
Calibration Plan Summary
Cycle 4 Calibration Plan
Internal Monitors
Photometric Monitors
Earth flats
Cycle 5 Calibration Plan
Cycle 6 Calibration Plan
Cycle 7 Calibration Plan
Overview
Cycle 8 Calibration Plan
Introduction
Overview
Cycle 9 Calibration Plan
Cycle 10 Calibration Plan
Future Calibrations, Calibration by Observers, and Calibration Outsourcing
Calibration Accuracy

Appendix 1: Passband Plots

Filter Passbands, with and w/out Total System
F122M, F130LP, F160BW
F165LP, F170W, F185W
F218W, F255W, F300W
F336W, F343N, F375N
F380W, F390N, F410M
F437N, F439W, F450W
F467M, F469N, F487N
F502N, F547M, F555W
F569W, F588N, F606W
F622W, F631N, F656N
F658N, F673N, F675W
F702W, F785LP, F791W
F814W, F850LP, F953N
F1042M, FQUVN-A, FQUVN-B
FQUVN-C, FQUVN-D, FQCH4N-A
FQCH4N15-B, FQCH4N33-B, FQCH4N-C
FQCH4N-D, Parallel and Perpendicular Polarizers
Normalized Passbands including System Response

Appendix 2: Point Source SNR Plots

Plots for Estimating Point Source SNR

Acronyms

References

References
Instrument Science Reports
Technical Instrument Reports
Other Selected Documents
The WFPC2 Clearinghouse

Index


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