Design and progress of the CMOS Mosaic Camera for Earth 2.0's microlensing telescope

The Exoplanet Earth Science Survey Satellite (Earth 2.0) is planned to be deployed in a halo orbit around the Sun–Earth L2 point. It will function as a space observatory consisting of six wide - field transit telescopes and one microlensing telescope. By combining the transit and microlensing methods, it will conduct a large - scale survey of terrestrial planets and free - floating planets. The microlensing CMOS camera is assembled from four 9K×9K detectors tiled together with guiding detectors. When combined with high - precision thermal control and readout electronics, it can achieve highly stable photometry with a single - exposure signal-to-noise ratio ≥ 5 for targets of 20.5 magnitude. The relevant key technologies have been validated using a prototype camera, which demonstrates that they meet the requirements of both scientific observations and engineering implementation.