Thermal performance and facility seeing at the upgraded 3.8-m UK Infrared Telescope (UKIRT)

Details Thermal performance and facility seeing at the upgraded 3.8-m UK Infrared Telescope (UKIRT) Thermal performance and facility seeing at the upgraded 3.8-m UK Infrared Telescope (UKIRT)

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4004..104h&link_type=abstract

Proc. SPIE Vol. 4004, p. 104-114, Telescope Structures, Enclosures, Controls, Assembly/Integration/Validation, and Commissioning

Physics

Optics

1

Scientific paper

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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