Contact: Rob Gutro
NASA/Goddard Space Flight Center
Caption: The Center Of Curvature Optical Assembly (COCOA) will allow the program to verify the optical performance of the 21.3-foot (6.5-meter) primary mirror at its 40 degrees Kelvin (-233 Celsius) operating temperature. The COCOA contains mechanical and optical instruments that allow the test team to identify, align and test the 18-segments from outside the vacuum chamber.
Credit: Note: The background of this image has been digitally removed. Credit: ITT Exelis
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Related news release: For NASA Webb telescope engineers, COCOA this winter means precision testing