The LSST SIM tables contain a large simulation, based on the TRILEGAL code, of the stars to be observed by the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). TRILEGAL uses databases of stellar evolutionary tracks, synthetic spectra, and pulsation models, added to simple prescriptions for the stellar density and star formation histories of the main structures of the Galaxy, to generate mock stellar samples through a population synthesis approach.

LSST SIM provides tables containing a complete simulation for single stars in the Milky Way and Magellanic Clouds down to a depth of r=27.5 mag, equivalent to the co-added depth from the Wide-Fast-Deep portion of the LSST survey. LSST SIM also provides a table for a subset of the anticipated binary systems, including interacting ones, as derived with the BinaPSE module of TRILEGAL.

LSST SIM at a Glance
Table Area Bands Depth N
simdr2 ~27,000 deg2 ugrizY, Gaia G,Bp,Rp ~27.5 mag 11,433,322,690
simdr2_binary ~27,000 deg2 ugrizY, Gaia G,Bp,Rp 659,455,991
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The goal of LSST SIM is to aid in the preparation and interpretation of analyses of the Rubin LSST survey by providing a simulation of all stars that will be visible in the final stacked LSST images across the LSST footprint.

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Data Releases

LSST SIM Data Release 2 (DR2) supersedes Data Release 1 (DR1), which did not include the Magellanic Clouds or information on binary systems. DR1 also contained some spurious artifacts that have been corrected in DR2.

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