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BOULDER, Colo., Feb. 7 /PRNewswire-FirstCall/ -- The final segment of the flight primary mirror for NASA's James Webb Space Telescope (JWST) has completed manufacturing and been delivered for grinding and polishing, a major milestone achieved by Ball Aerospace & Technologies, Corp. and its subcontractors.
The beryllium mirror segment, one of 18 segments that comprise the telescope's 6.6-meter primary mirror, was delivered from Axsys Technologies,Inc. in Cullman, Ala, to L-3 Communications SSG-Tinsley in Richmond , Calif.
"We are now moving into a new phase on JWST following 17 months in which the telescope has achieved all testing milestones required for Technology Readiness Level (TRL) 6, including Wavefront Sensing and Control met by Ball Aerospace last month," said David L. Taylor, president and chief executive officer of Ball Aerospace.
One of the lightest of all metals, beryllium has a demonstrated track record of performing on space telescopes at cryogenic temperatures, needed for JWST's infrared observations. Each of the 18 hexagonal-shaped mirror segments measures a little more than 1.3 meters across, and weighs approximately 20 kilograms or 46 pounds after light-weighting. The completed JWST optics will have more than nine times the effective light-collecting area of the Hubble Space Telescope's optics, yet the JWST primary mirror will weigh only about half as much as Hubble's.
Ball Aerospace is the principal optical subcontractor for the JWST program, led by prime contractor Northrop Grumman Space Technology, under a contract from the NASA Goddard Space Flight Center, in Greenbelt, Md. A secondary and tertiary mirror, plus flight spares, will be delivered to Ball Aerospace from its mirror manufacturing team that includes Brush Wellman, in addition to Axsys and L-3 Communications. As each mirror completes grinding and polishing and is delivered to Ball Aerospace during the next four years, it will be mounted onto a lightweight, actuated strong-back assembly and undergo functional and environmental testing.