STScI

Wide Field and Planetary Camera 2 Instrument Handbook for Cycle 14

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Chapter 6:
System Throughput and SNR / Exposure Time Estimation


6.1 System Throughput
6.2 On-Line Exposure Time Calculator
6.3 Target Count Rates
    6.3.1 Count Rates for Stellar Sources
    6.3.2 Count Rates for Power Law Sources
    6.3.3 Count Rates for Emission Line Sources
6.4 Sky Background
6.5 Signal-to-Noise Ratio Estimation
    6.5.1 Point Sources -- PSF Fitting
    6.5.2 Point Sources -- Aperture Photometry
    6.5.3 Extended Sources
6.6 Exposure Time Estimation
6.7 Sample SNR Calculations
    6.7.1 Point Sources
    6.7.2 Extended Sources
    6.7.3 Emission Line Sources
6.8 Photometric Anomalies
6.9 Red Leaks in UV Filters
6.10 Long-term Photometric Stability
6.11 Short-term Time Dependence of UV Response

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