Daniel K. Inouye Solar Telescope

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Daniel K. Inouye Solar Telescope
Haleakala Observatory 2017.jpg
Daniel K. Inouye Solar Telescope on the left hand side
Alternative names DKIST Edit this at Wikidata
Named after Daniel Inouye Edit this on Wikidata
Observatory Haleakala Observatory Edit this on Wikidata
Location(s) Maui, Hawaii, US
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 Edit this at Wikidata
Organization Association of Universities for Research in Astronomy Edit this on Wikidata
Altitude 3,084 m (10,118 ft) Edit this at Wikidata
Wavelength 380 nm (790 THz)-5,000 nm (60 THz)
Built January 2013 Edit this on Wikidata (January 2013 Edit this on Wikidata) Edit this at Wikidata
First light 2019 Edit this on Wikidata
Telescope style Gregorian telescope
Optical telescope
Solar telescope Edit this on Wikidata
Diameter 4.24 m (13 ft 11 in) Edit this at Wikidata
Secondary diameter 0.65 m (2 ft 2 in) Edit this at Wikidata
Mounting Altazimuth mount Edit this on Wikidata Edit this at Wikidata
Website dkist.nso.edu Edit this at Wikidata
Daniel K. Inouye Solar Telescope is located in Hawaii
Daniel K. Inouye Solar Telescope
Location of Daniel K. Inouye Solar Telescope

The National Science Foundation's Daniel K. Inouye Solar Telescope (DKIST), known as the Advanced Technology Solar Telescope (ATST) until 2013, is a large solar telescope managed by the National Solar Observatory, that is currently under construction.[1] With a planned completion date of 2019, 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 or bright solar disk. 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 20 km (10 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,[5] and work on the telescope housing was completed in September 2013.[6]

The primary mirror was delivered to the site the night of 1–2 August 2017[7] and as of August 2017 the telescope structure is nearly complete, with first light expected in 2019.[8]


As of 2014, twenty-two institutions had joined the collaboration building DKIST:[9]

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. ^ "Primary mirror delivered to Daniel K. Inouye Solar Telescope" (Press release). National Science Foundation. 3 August 2017. News Release 17-072. 
  8. ^ Loomis, Ilima (4 August 2017). "House of the sun". Science. 357 (6350): 444–447. Bibcode:2017Sci...357..444L. doi:10.1126/science.357.6350.444. 
  9. ^ "Collaborating Institutions". dkist.nso.edu. Retrieved 14 May 2014.