2 August 2000 Thermal performance and facility seeing at the upgraded 3.8-m UK Infrared Telescope (UKIRT)
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Abstract
The upgraded 3.8 m UK Infrared Telescope employs active control of the primary mirror figure and secondary mirror alignment to constrain intrinsic wavefront errors, currently to approximately 180 nm, while a fast guider controls a tip- tilt secondary to remove telescope vibrations and tracking errors. It routinely produces images with FWHM below 0.'5 at 2.2 micrometers wavelength (the K-band). The best fully-sampled image yet recorded has FWHM equals 0.'171 and is believed still to be the best ever achieved by a ground-based telescope without the use of higher-order adaptive optics.
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Timothy G. Hawarden, Andrew J. Adamson, Timothy C. Chuter, Nicholas P. Rees, Richard J. Massey, Charles P. Cavedoni, Eli Ettedgui-Atad, "Thermal performance and facility seeing at the upgraded 3.8-m UK Infrared Telescope (UKIRT)", Proc. SPIE 4004, Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning, (2 August 2000); doi: 10.1117/12.393905; https://doi.org/10.1117/12.393905
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