The United Kingdom Infrared Telescope (UKIRT) is a 3.8-meter diameter reflector telescope specifically designed for infrared observations, located at the Mauna Kea Observatory in Hawaii. This telescope is one of the largest and most advanced in its category, with a history of significant contributions to the field of infrared astronomy. Originally operated by the United Kingdom through the Joint Astronomy Centre (JAC), in 2014 the telescope’s ownership was transferred to the University of Hawaii. It is now funded by NASA and operated in collaboration with institutions such as Lockheed Martin Advanced Technology Center and the United States Naval Observatory.

The telescope features a classic Cassegrain design with an English equatorial mount. One of its standout features is its primary mirror, which is thinner and lighter than those of other telescopes of its class, weighing only 6.5 tons. This allows for the use of less powerful motors and control systems, reducing heat generation, which is crucial for infrared observations where heat can interfere with the data. The mirror is supported by 80 aluminum pistons that are computer-controlled to maintain its optimal shape during observations. Although its equatorial mount limits access to objects at certain declinations, the telescope remains highly effective for a wide range of astronomical research, including the study of Solar System objects, star formation, and the observation of distant galaxies.