Week 34 of the Early Operations system optimization period
Clouds and snow at Cerro Pachón continued to limit the on-sky time this week. The Simonyi Survey Telescope was fully closed on four nights and closed early on two other nights. All of the on-sky observations were for the pre-LSST campaign, mostly looking through clouds and with poor atmospheric seeing. There were no dedicated on-sky engineering tests this week given the conditions. The team continued to take calibration data and run thermal control tests for the primary-tertiary (M1M3) mirror.
The team has prepared multiple updates for the Active Optics System (AOS) to validate on sky at the next opportunity, and is planning several other on-sky engineering tests to gather diagnostic data to develop the next round of updates. Those tests will be interleaved with pre-LSST observations.
The currently installed filter set is ugriz.