Rubin's 8.4-meter primary/tertiary mirror is installed

In the first week of October 2024, the team on Cerro Pachón installed Rubin Observatory's 8.4-meter combined primary/tertiary mirror (M1M3) on the Simonyi Survey Telescope for the first time. With all three mirrors and the commissioning camera (ComCam) now in place —Rubin officially has a complete telescope! After getting this version of the telescope on-sky and conducting several months of testing, the team will remove the 144-megapixel ComCam and install the final science component — the car-sized, 3200 megapixel LSST Camera.