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Who built the 1.4 m (55 inch) primary mirror and what is it made of?

April 26, 2017built inch mirror primary

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Who built the 1.4 m (55 inch) primary mirror and what is it made of?

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Corning Incorporated (New York) provided the mirror blanks of fused silica for the primary and corrector plate. Brashear LP (Pennsylvania) figured the primary and corrector plate for the Schmidt telescope that is the main instrument. Ball Aerospace and Technologies Corporation (Colorado) constructed the spacecraft.