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Object NameSegment of HALO Aspherical Mirror with Actuators
Manufacturer Corning Glass Works, Corning
Manufacturer Raytheon Optical Systems, Inc. (ROSI)
Made FromULE Glass, Metal, Graphite Epoxy
Place MadeUnited States, MA, Lexington; United States, NY, Corning (glass)
SizeFrame H: 170.2 cm, W: 254 cm, D: 131.5 cm; Glass H: 98.8 cm, W: 254 cm
Accession Number99.8.12
Credit LineGift of Raytheon Optical Systems, Inc. (ROSI)
Curatorial Area(s)
On ViewGlass Innovation Center. Optics Gallery.
Interpretive Notes
The High Altitude Large Optics (HALO) telescope mirror is made from ULE (TM) glass. Although changes in temperature won't distort it, the mirror is too thin to be totally rigid. Hundreds of actuators - small, computer-controlled "feet" - are needed to support and focus it. Zero-expansion materials, such as ULE (TM) glass, along with computer controls, have made large telescopes like the HALO possible.
Physical DescriptionSegment of HALO Aspherical Mirror with Actuators. Colorless ULE glass, metal, graphite epoxy. Section of concave circular mirror with lightweighting pockets atop 45 fine figure activators, extension tubes of graphite epoxy.
Provenance
Source Raytheon Optical Systems, Inc. (ROSI) - 1999

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