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NASA James Webb Space Telescope’s Sunshield Successfully Unfolds and Tensions in Final Tests

The James Webb Space Telescope’s final tests are underway with the successful completion of its last sunshield deployment test, which occurred at Northrop Grumman in Redondo Beach, California. Credit: NASA/Chris Gunn

Lengthened to the size of a tennis court, the five-layer sunshield of NASA’s fully assembled James Webb Space Telescope successfully completed a final series of large-scale deployment and tensioning tests. This milestone puts the observatory one step closer to its launch in 2021.

“This is one of Webb’s biggest accomplishments in 2020,” said Alphonso Stewart, Webb deployment systems lead for NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “We were able to precisely synchronize the unfolding motion in a very slow and controlled fashion and maintain its critical kite-like shape, signifying it is ready to perform these actions in space.”

The sunshield protects the telescope and reflects light and background heat from the Sun, Earth, and Moon into space. The observatory must be kept cold to accomplish groundbreaking science in infrared light, which is invisible to human eyes and felt as heat.

In the sunshield’s shadow, Webb’s innovative technologies and sensitive infrared sensors will allow scientists to observe distant galaxies and study many other intriguing objects in the universe.

Maintaining the sunshield’s shape involves a delicate, complicated process.

Technicians Inspect James Webb Space Telescope's Sunshield

To help ensure success, technicians carefully inspect the James Webb Space Telescope’s sunshield before deployment testing begins, while it is occurring, and perform a full post-test analysis to ensure the observatory is operating as planned. Credit: NASA/Chris Gunn

“Congratulations to the entire team. Due to Webb’s large size and stringent performance requirements, the deployments are incredibly complex. In addition to the required technical expertise, this set of tests required detailed planning, determination, patience and open communication. The team proved that it has all these attributes. It’s amazing to think that next time Webb’s sunshield is deployed it will be many thousands of miles away, hurtling through space,” said James Cooper, Webb’s sunshield manager at Goddard.

The Kapton® polymer-coated membranes of Webb’s sunshield were fully deployed and tensioned in December at Northrop Grumman in Redondo Beach, California. Northrop Grumman designed the observatory’s sunshield for NASA.

During testing, engineers sent a series of commands to spacecraft hardware that activated 139 actuators, eight motors, and thousands of other components to unfold and stretch the five membranes of the sunshield into its final taut shape. A challenging part of the test is to unfold the sunshield in Earth’s gravity environment, which causes friction, unlike unfolding material in space without the effects of gravity.

James Webb Space Telescope Sunshield Fully Deployed

Shown fully deployed with all five of its layers tensioned, this is the last time the James Webb Space Telescope’s sunshield will be completely unfurled on Earth. Credit: NASA/Chris Gunn

For launch the sunshield will be folded up around two sides of the observatory and placed in an Ariane 5 launch vehicle, which is provided by the European Space Agency.

In this test, two pallet structures that hold the sunshield upright folded down, then two huge “arms” (known as the Mid-Boom Assembly) of the sunshield slowly telescoped outward, pulling the folded membranes along with them to resemble the synchronized movements of a very slowly choreographed dance. Once the arms locked in their horizontal position, the membranes of the sunshield were successfully tensioned individually starting with the bottom layer, separating each into their fully deployed shape.

The large sunshield divides the observatory into a warm, Sun-facing side (about 185 degrees Fahrenheit) and a cold-space-facing side (minus 388 degrees Fahrenheit) comprised of the optics and scientific instruments. The sunshield will protect the observatory’s optics and sensors, so they remain at extremely cold temperatures to conduct science.

“This milestone signals that Webb is well on its way to being ready for launch. Our engineers and technicians achieved incredible testing progress this month, reducing significant risk to the project by completing these milestones for launch next year,” said Bill Ochs, project manager for Webb at Goddard. “The team is now preparing for final post-environmental deployment testing on the observatory these next couple of months prior to shipping to the launch site next summer.”

Webb has passed other rigorous deployment tests during its development, which successfully uncovered and resolved technical issues with the spacecraft. These tests validate that once in orbit, the observatory and its many redundant systems will function flawlessly.

The James Webb Space Telescope will be the world’s premier space science observatory when it launches in 2021. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and the Canadian Space Agency.


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