Webb’s NIRSpec Acquires Multiple Targets

A simulation of the NIRSpec MSA-based Target acquisition process, demonstrated on the NIRSpec Sharpness Check Image. NIRSpec uses “Reference Stars” observed through the fixed slits in the central area and the MSA to carefully correct the small x – y and position angle (rotation) offsets of the observatory so that the science targets will be aligned properly with their shutters across the entire NIRSpec MOS field of view. Credit: NASA, ESA, and the NIRSpec Team