KEYWORDS: Signal to noise ratio, Java, Sensors, Instrument modeling, Space telescopes, Software development, Point spread functions, Astronomy, Observatories, Human-machine interfaces
The Astronomer Proposal Tool (APT) Exposure Time Calculator (ETC) is a generic Java library for performing ETC calculations. Currently it is primarily used by the web based ETCs supporting Hubble Space Telescope (HST) proposals at Space Telescope Science Institute (STScI). This paper describes the software architecutre, current and potential uses of this library.
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