STScI

WFPC2 Instrument Handbook for Cycle 10

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Chapter 6:
System Throughput and SNR / Exposure Time Estimation

In This Chapter...

System Throughput

On-Line Exposure Time Calculator

Target Count Rates

Sky Background

Signal-to-Noise Ratio Estimation

Exposure Time Estimation

Sample SNR Calculations

Long-term Photometric Stability

Short-term Time Dependence of UV Response



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