Daniel K. Inouye Solar Telescope

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Daniel K. Inouye Solar Telescope (DKIST)
Organisation Collaboration of 22 institutions
Location(s) Haleakala Observatory, Maui, Hawaii, United States
Coordinates 20°42′24″N 156°15′22″W / 20.7068°N 156.2561°W / 20.7068; -156.2561Coordinates: 20°42′24″N 156°15′22″W / 20.7068°N 156.2561°W / 20.7068; -156.2561
Wavelength 300nm – 12µm[not verified in body]
Telescope style Off-axis, all-reflecting Gregorian telescope
Diameter 4.0 m (160 in)
Angular resolution 0.023 arcsec at 400 nm[not verified in body]
Mounting Alt-azimuth
Website http://dkist.nso.edu/

The Daniel K. Inouye Solar Telescope (DKIST), known as the Advanced Technology Solar Telescope (ATST) until 2013, is a large solar telescope that is currently under construction.[1] With a planned completion date of 2018, it is expected to become the world's largest solar telescope. It is a collaboration of numerous research institutions.

The telescope will have a 4.0-metre (160 in) diameter primary mirror housed in a large dome,[2] located at Haleakala Observatory on the Hawaiian island of Maui. While still under construction, the telescope was officially named after a US Senator for Hawaii, Daniel K. Inouye.[3]


DKIST features an off-axis, clear aperture design. This avoids a central obstruction, minimizing scattered light when observing the faint solar corona. It also eases operation of adaptive optics and later image reconstruction such as speckle imaging.[citation needed]

The site on the Haleakala volcano was selected for its clear daytime weather and favourable atmospheric seeing conditions.[citation needed] The DKIST design is intended to enable high-resolution observations of features on the Sun as small as 30 km (20 mi).[citation needed]


The contract to build the telescope was awarded in 2010, with a then-planned completion date of 2017.[4] Physical construction at the DKIST site began in January 2013 and is currently under way as of August 2015[5] Work on the telescope housing was completed in September 2013.[6]


As of 2014, twenty-two institutions had joined the collaboration building DKIST:[7]

See also[edit]



  1. ^ "The Advanced Technology Solar Telescope". Retrieved 2013-09-26. 
  2. ^ "ATST Schematic". Archived from the original on 1 February 2009. Retrieved 2009-02-12. 
  3. ^ "Solar Telescope Named for Late Senator Inouye". National Solar Observatory. 16 December 2013. Retrieved 21 October 2015. 
  4. ^ "NSF Selects NSO to Build World's Largest Solar Telescope" (Press release). SpaceRef. 22 January 2010. Retrieved 2017-03-16. 
  5. ^ "Building the DKIST – Image Gallery". dkist.nso.edu. Archived from the original on 13 September 2014. Retrieved 22 August 2015. 
  6. ^ Durand, Pierrot (2013-09-21), "Work on Dome Completed, say Spanish Companies", French Tribune, retrieved 2013-09-26.  (Note that the illustration accompanying the article is a 2012 artist’s rendering of the Thirty Meter Telescope calotte dome, and looks nothing like the actual ATST enclosure.)
  7. ^ "Collaborating Institutions". dkist.nso.edu. Retrieved 14 May 2014.