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Deployment test of Webb's secondary mirror

Deployment test of Webb's secondary mirror


Date: 19 August 2019
Satellite: JWST
Depicts: Flight telescope
Copyright: NASA/Chris Gunn

The secondary mirror of the NASA/ESA/CSA James Webb Space Telescope (JWST) – visible from the back in the top right corner of the image – after a successful deployment test at Northrop Grumman Aerospace Systems in Redondo Beach, California.

Folded together with the other observatory components during launch, the secondary mirror will be deployed as part of an intricate choreography that will bring the observatory to life once in space. When deployed, like in this view, it faces Webb’s iconic honeycomb-like pattern of 18 hexagonal, gold-coated primary mirror segments. This primary mirror structure is seen in the lower left of the image in its folded configuration, showing only 12 segments.

The James Webb Space Telescope is an international project led by NASA with its partners, ESA and the Canadian Space Agency. As part of its contribution to the project, ESA provides the NIRSpec instrument, the Optical Bench Assembly of the MIRI instrument, the Ariane 5 launcher, and staff to support mission operations at the Space Telescope Science Institute (STScI) in Baltimore, USA.

Last Update: 1 September 2019
17-Sep-2019 21:11 UT

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