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Adjusting the Focus of 18 James Webb Telescope Mirrors, Here’s How the Hexagonal Star Was Recorded

TELESCOPE Outer Space James Webb completed one of the first important stages of the process namely aligning the observatory’s 18-segment main mirror. A single star observed by the observatory was deliberately changed 18 times into a hexagonal shape.

In the end, the 18 images will be perfectly aligned into one sharp focus. The interim result depicts perfectly repeating stars in a hexagonal pattern, reminiscent of stunning celestial snowflakes.

“The resulting images show that the team has moved 18 segments of James Webb’s main mirror to record 18 unfocused copies of the single star into a hexagonal formation,” NASA officials wrote in a blog post Friday, February 18, 2022.

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The image of the stars is directed to a special pattern that was planned as part of the alignment of the 18 mirrors of the James Webb Telescope. Subsequently, the James Webb Telescope observatory began fixing larger positioning errors in individual segments of the primary mirror and updating the alignment of the secondary mirrors.

“So they (18 mirrors) have the same relative location as the focal position of the mirror,” said Matthew Lallo, scientist and telescope manager at the Space Telescope Science Institute.

Once the segment alignment is completed successfully, the team will begin the third phase, which is image stacking. It will eventually merge the 18 images on top of each other into one clear and more focused view.

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Lallo said the three-phase procedure would allow the team to use an intuitive and natural way to visualize change. “We can now actually watch the main mirror slowly form into the precise and desired shape,” he said.

Aligning the mirrors correctly is a key goal of the James Webb telescope commissioning process and is expected to be completed by the summer. The James Webb telescope mission launches December 25, 2021, to observe the universe, exoplanets, and other points of interest in the cosmos.


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