"The big thing is getting the 18 primary mirror segments pointing in a similar way so that their images are about the same size," Feinberg said."Some of them might be very defocused and so you might get a big spot on segment 5 and a small spot on segment 3."
"At the very top level, think of it as 18 separate telescopes aligned to about the same level," Feinberg said."And then we will overlap 18 spots on top of each other. We call that image stacking. It is a process of tilting the primary mirror segments so that the images fall on top of each other." Each of Webb's 18 primary mirror segments features a"hexapod" attached to the backside with six actuators allowing engineers to precisely position each one. A seventh actuator can adjust the curvature of a mirror segment if required.Any given segment can lose one of its six tilt actuators with no impact. Even the loss of a center actuator can be compensated for to some degree by moving the segment up or down slightly.
"When will we have an image of a star that's phased? I think that's going to be sometime in March, maybe late March," he said.
Critical mirror alignment.
Very cool.
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