Science

$10B Webb Space Telescope Completes Testing and Prepares for Trip to Europe’s Spaceport

Artist Concept NASA James Webb Space Telescope

Artist’s concept of NASA’s James Webb Space Telescope. Credit: NASA, ESA, and Northrop Grumman

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NASA’s James Webb Space Telescope Assembled and Tested

With integration and testing formally concluded for the James Webb Space Telescope, NASA’s next giant leap into the cosmic unknown will soon be underway. Credit: NASA/Chris Gunn

The upper stage of the Ariane 5, which will carry Webb to space later this year, is already on its way to Europe’s Spaceport. Overnight on August 17, 2021, the upper stage was transported in its container from ArianeGroup in Bremen to Neustadt port in Germany. Here it boarded the MN Toucan vessel alongside other Ariane 5 elements loaded in various European harbors to continue its journey to Kourou, French Guiana.

The James Webb Space Telescope is an amazing feat of human ingenuity – a mission with contributions from thousands of scientists, engineers, and other professionals from more than 14 countries and 29 states, in nine different time zones. 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. Besides that, ESA is contributing the NIRSpec instrument and a 50% share of the MIRI instrument, as well as personnel to support mission operations.

Webb Launch Timeline at Europe’s Spaceport

Webb launch timeline at Europe’s Spaceport. Credit: ESA

“We are glad about the completion of all tests for Webb and thank all the teams for their excellent work. We are really excited that all the items necessary for the launch are now coming together at Europe’s Spaceport,” said Günther Hasinger, ESA Director of Science.

After launch, Webb will undergo an action-packed six-month commissioning period. Moments after completing a 26-minute ride aboard the Ariane 5 launch vehicle, the spacecraft will separate from the rocket and its solar array will deploy automatically.

Immediately after Webb separates from the rocket, ESA’s tracking station network, ESTRACK, will follow the Early Orbit Phase operations using its Malindi ground station in collaboration with NASA’s station network.

Ariane 5 Upper Stage for Webb Heads for Europe’s Spaceport

The upper stage of the Ariane 5 rocket which will launch the James Webb Space Telescope later this year, is on its way to Europe’s Spaceport in French Guiana. Credit: ArianeGroup

Webb will take one month to fly to its intended orbital location in space nearly one million miles away from Earth, slowly unfolding as it goes. Sunshield deployments will begin a few days after launch, and each step can be controlled expertly from the ground, giving Webb’s launch full control to circumnavigate any unforeseen issues with deployment.

Once the sunshield starts to deploy, the telescope and instruments will enter shade and start to cool over time. Over the ensuing weeks, the mission team will closely monitor the observatory’s cooldown, managing it with heaters to control stresses on instruments and structures. In the meantime, the secondary mirror tripod will unfold, the primary mirror will unfold, Webb’s instruments will slowly power up, and thruster firings will insert the observatory into a prescribed orbit.

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

Once the observatory has cooled down and stabilized at its frigid operating temperature, several months of alignments to its optics and calibrations of its scientific instruments will occur. Scientific operations are expected to commence approximately six months after launch.

For more on this story, see NASA’s $10 Billion James Webb Space Telescope Has Successfully Completed Testing.

‘Flagship’ missions like Webb are generational projects. Webb was built on both the legacy and the lessons of missions before it, such as the NASA/ESA

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