Segment of HALO Aspherical Mirror with Actuators

Object Name: 
Segment of HALO Aspherical Mirror with Actuators

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Object Name: 
Segment of HALO Aspherical Mirror with Actuators
Accession Number: 
99.8.12
Dimensions: 
Frame H: 170.2 cm, W: 254 cm, D: 131.5 cm; Glass H: 98.8 cm, W: 254 cm
Location: 
On Display
Credit Line: 
Gift of Raytheon Optical Systems, Inc. (ROSI)
Web Description: 
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.
Provenance: 
Raytheon Optical Systems, Inc. (ROSI), Source
1999
Primary Description: 
Segment 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.