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The Construction Project Status page presents a timeline for key events in early operations w.r.t. the date of System First Light (also referred to as Rubin First Light, and currently no sooner than 16-May-2025), as follows:

  • Data Preview 1: contains a subset of early commissioning data, i.e. from ComCam, and provisionally LSSTCam; released to data rights holders 2-3 months after System First Light - i.e., mid-no sooner than July 2025

  • LSST Survey Start: 4-7 months after System First Light - i.e., late no sooner than September 2025

  • Data Preview 2: 9-12 months after System First Light contains Science Verification data obtained with LSSTCam; released to data rights holders no sooner than 6 months after survey starts - i.e., mid-no sooner than April 2026

  • Data Release 1: 12-14 contains first six months of survey data; released to data rights holders no sooner than 12 months after LSST Survey Start - i.e., late no sooner than September 2026

Data Release 2 is expected six months after Data Release 1 (i.e., mid-no sooner than Spring 2027), and subsequent data releases are expected annually thereafter.