Update: The James Webb* telescope will be the largest, most powerful and complex space telescope ever built and launched into space. It will fundamentally alter our understanding of the universe. NASA announced in August that the James Webb Space Telescope had passed its final ground-based tests and was being prepared for shipment to its launch site in Kourou, French Guiana. Now, the oft-delayed $10 billion telescope has an official launch date: December 25, 2021.
James Webb Space Telescope Launch Update
NASA and Arianespace successfully completed the Launch Readiness Review for the James Webb Space Telescope on Dec. 21. The team authorized the Ariane 5 rocket carrying Webb to rollout and the start of launch sequencing for the mission.
However, due to adverse weather conditions at Europe’s Spaceport in French Guiana, the flight VA256 to launch Webb – initially scheduled for Dec. 24 – is being postponed.
The new targeted launch date is Dec. 25, as early as possible within the following launch window:
Between 7:20 a.m. and 7:52 a.m. Washington
- Between 9:20 a.m. and 9:52 a.m. Kourou
- Between 12:20 p.m. and 12:52 p.m. Universal (UTC)
- Between 1:20 p.m. and 1:52 p.m. Paris
- Between 9:20 p.m. and 9:52 p.m. Tokyo
Tomorrow evening, another weather forecast will be issued in order to confirm the date of December 25. The Ariane 5 launch vehicle and Webb are in stable and safe conditions in the Final Assembly Building.
The agency set the new target launch date in coordination with Arianespace after Webb recently and successfully completed its rigorous testing regimen – a major turning point for the mission. The new date also follows Arianespace successfully launching an Ariane 5 rocket in late July and scheduling a launch that will precede Webb. The July launch was the first for an Ariane 5 since August 2020.
Webb, an international program led by NASA with its partners ESA (European Space Agency) and the Canadian Space Agency, will launch on an Ariane 5 from Europe's Spaceport in French Guiana on the northeastern coast of South America. ESA is providing the Ariane 5.
The highly complex space telescope is currently resting in its final stow configuration at Northrop Grumman’s facilities in Redondo Beach, California. (Editor's Note: One of the most expensive cities in the U.S.)
“Webb is an exemplary mission that signifies the epitome of perseverance,” said Gregory L. Robinson, Webb’s program director at NASA Headquarters in Washington. “I am inspired by our dedicated team and our global partnerships that have made this incredible endeavor possible. Together, we’ve overcome technical obstacles along the way as well as challenges during the coronavirus pandemic. I also am grateful for the steadfast support of Congress. Now that we have an observatory and a rocket ready for launch, I am looking forward to the big day and the amazing science to come.”
The Webb team is preparing for shipment operations, during which the observatory will undergo final closeout procedures and packing for its journey to the launch site. The major elements of the Ariane 5 rocket that will carry Webb into space have safely arrived in Kourou, French Guiana, from Europe.
The Webb telescope’s revolutionary technology will explore every phase of cosmic history – from within our solar system to the most distant observable galaxies in the early universe, and everything in between. Webb will reveal new and unexpected discoveries, and help humankind understand the origins of the universe and our place in it.
For further information about the Webb mission, visit: www.webb.nasa.gov; Alise M. Fisher / Natasha R. Pinol
Headquarters, Washington: alise.m.fisher@nasa.gov / natasha.r.pinol@nasa.gov
For information about the construction and engineering of the Webb telescope, visit: www.nasa.gov/webb
*James Edwin Webb, (born October 7, 1906, Tally Ho, North Carolina, U.S.— died March 27, 1992, Washington, D.C.), American public servant and administrator of the National Aeronautics and Space Administration (NASA) during the Apollo program (1961–68).
