To help facilitate the development of the Transiting Exoplanet Survey Satalite (TESS) data analysis pipeline, it was necessary to produce simulated flight data with sufficient fidelity and volume to exercise all the capabilities of the pipeline in an integrated way. As a generator of simulated flight data, Lilith, was developed for this purpose. We describe the capabilities of the Lilith software package, with particular attention to the interaction between the implemented features and the pipeline capabilities that it exercises. Using a physics-based TESS instrument and sky model, Lilith creates a set of raw TESS data which includes models for the CCDs, readout electronics, camera optics, behavior of the attitude control system (ACS), spacecraft orbit, spacecraft jitter and the sky, including zodiacal light, and the TESS Input Catalog. The model also incorporates realistic instances of stellar astrophysics, including stellar variability, eclipsing binaries, background eclipsing binaries, transiting planets and diffuse light. This simulated data is then processed through the TESS pipeline generating full archivable data products. Full instrumental and astrophysics ground truth is available and can be used as a training set for TESS data analysis software, such as when training a machine learning classifier for planet candidates. Our intention is to continue to tune Lilith as real TESS flight data becomes available, allowing for an up-to-date simulated set of data products to complement the mission flight data products, thereby aiding researchers as they continue to adapt their tools to the TESS data streams. We discuss the execution performance of the resulting package, and offer some suggestions for improvements for instrument and sky simulators to be developed for other missions.
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