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Webb Space Telescope Deployment Complete – “Complex but Impressive Engineering Masterpiece”

Webb Space Telescope Primary Mirror Deployment
Webb Space Telescope Primary Mirror Deployment

Webb Space Telescope Primary Mirror Deployment. Credit: NASA’s Goddard Space Flight Center Conceptual Image Lab

On January 8, the successfully fully deployed its iconic 6.4-meter, gold-coated primary mirror, completing the final stage of all major spacecraft deployments to prepare for science operations.

“The successful unfolding of the Webb telescope has been a complex but impressive engineering masterpiece. On behalf of ESA, I want to sincerely congratulate our colleagues at

The two wings of Webb’s primary mirror were folded to fit inside the fairing of an ESA-provided Ariane 5 rocket prior to launch. After more than a week of other critical spacecraft deployments, the Webb team began remotely unfolding the hexagonal mirror segments of the largest mirror ever launched into space.

This was a multi-day process, with the first (port) side of the mirror deployed on January 7 and the second (starboard) side of the mirror deployed on January 8. Mission Operations Center ground control at the Space Telescope Science Institute in Baltimore began deployment of the starboard mirror at 13:53 Webb Space Telescope Unfolding Sequence

During the first month in space, on its way to the second Langrange point (L2), Webb will undergo a complex unfolding sequence. Key steps in this sequence are unfolding Webb’s sunshield – a five-layer, diamond-shaped structure the size of a tennis court – and the iconic 6.5-meter wide mirror, consisting of a honeycomb-like pattern of 18 hexagonal, gold-coated mirror segments. Credit: ESA

Soon, Webb will also make a third mid-course correction burn – one of three planned course corrections to place the spacecraft precisely in orbit around the second Lagrange point, commonly known as L2, 1.5 million km from Earth. This is Webb’s final orbital position, where its sunshield will protect it from light from the Sun, Earth and Moon that could interfere with observations of infrared light. Webb is designed to peer back over 13.5 billion years to capture infrared light from celestial objects with much higher resolution than ever before, and to study our own Solar System as well as distant worlds.

“We are thrilled that the complex telescope unfolding worked successfully. Now we hold our breath for the optics alignment, the instrument commissioning, and finally the fascinating first science results,” says Prof. Günther Hasinger, ESA Director of Science.

Webb Science Infographic

The James Webb Space Telescope (Webb) is designed to answer outstanding questions about the Universe and to make breakthrough discoveries in all fields of astronomy. Webb will see farther into our origins – from the Universe’s first galaxies, to the birth of stars and planets, and exoplanets with the potential for life. Closer to home, Webb will also look at our own Solar System. Credit: ESA

Webb is the largest, most powerful telescope ever launched into space. As part of an international collaboration agreement, ESA has provided the telescope’s launch service using the Ariane 5 launch vehicle. Working with partners, ESA was responsible for the development and qualification of Ariane 5 adaptations for the Webb mission and for the procurement of the launch service by Arianespace. ESA has also provided the workhorse spectrograph NIRSpec and 50% of the mid-infrared instrument MIRI, in collaboration with the University of Arizona. Webb is an international partnership between NASA, ESA, and the Canadian Space Agency (CSA).