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 namesDKIST Edit this at Wikidata
Named afterDaniel Inouye Edit this on Wikidata
ObservatoryHaleakala Observatory Edit this on Wikidata
Location(s)Maui, Hawaii, US
Coordinates20°42′17″N 156°10′36″W / 20.7047°N 156.1767°W / 20.7047; -156.1767Coordinates: 20°42′17″N 156°10′36″W / 20.7047°N 156.1767°W / 20.7047; -156.1767 Edit this at Wikidata
OrganizationAssociation of Universities for Research in Astronomy Edit this on Wikidata
Altitude3,084 m (10,118 ft) Edit this at Wikidata
Wavelength380 nm (790 THz)-5,000 nm (60 THz)
BuiltJanuary 2013 Edit this on Wikidata (January 2013 Edit this on Wikidata) Edit this at Wikidata
First light2019 Edit this on Wikidata
Telescope styleGregorian telescope
Optical telescope
Solar telescope Edit this on Wikidata
Diameter4.24 m (13 ft 11 in) Edit this at Wikidata
Secondary diameter0.65 m (2 ft 2 in) Edit this at Wikidata
MountingAltazimuth mount Edit this on Wikidata Edit this at Wikidata
Websitedkist.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 Daniel K. Inouye Solar Telescope (DKIST), is a scientific facility for studies of the sun under construction at Haleakala Observatory on the Hawaiian island of Maui named after Daniel K. Inouye, a US Senator for Hawaii.[1] With a planned completion date of 2019, it is expected to become the world's largest solar telescope sporting a 4-meter aperture. The DKIST is funded by National Science Foundation and managed by the National Solar Observatory. Until 2013 it was known as the Advanced Technology Solar Telescope (ATST). It is a collaboration of numerous research institutions.

The DKIST shall be capable of observing the Sun in visible to near-infrared wavelengths and will feature a 4.24-meter primary mirror in an off-axis Gregorian configuration that provides a 4-meter clear, unobstructed aperture. Adaptive optics shall correct for atmospheric schlieren in the solar image known as astronomical seeing to enable high-resolution observations of features on the sun as small as 20 km (10 mi). The off-axis, clear aperture design avoids a central obstruction, minimizing scattered light. It also eases operation of adaptive optics and digital image reconstruction such as speckle imaging.

The site on the Haleakala volcano was selected for its clear daytime weather and favourable atmospheric seeing conditions.[citation needed]

Construction[edit]

The contract to build the telescope was awarded in 2010, with a then-planned completion date of 2017.[2] Physical construction at the DKIST site began in January 2013,[3] and work on the telescope housing was completed in September 2013.[4]

The primary mirror was delivered to the site the night of 1–2 August 2017[5] and as of August 2017 the telescope structure is nearly complete, with first light expected in 2019.[6]

Main telescope structure[edit]

The 75 mm thick f/2 primary mirror is a 4.24-meter off-axis section of a 12-meter diameter, f/0.67 concave parabola. It was cast from Zerodur by Schott and polished at the Richard F. Caris Mirror Laboratory of the University of Arizona.

The 0.65-meter secondary mirror, a concave ellipsoid with a focal length of 1 meter, was made from silicon carbide and is mounted on a hexapod to compensate for thermal expansion and bending of the telescope structure keeping the mirror in its optimal position.

Adaptive Optics & Active Optics[edit]

Instrumentation[edit]

DKIST is expected to have five first-generation instruments.

Visible Broadband Imager (VBI)[edit]

The VBI is a diffraction-limited two-channel filtergraph each made of an interference filter and a digital scientific CMOS sensor camera that samples the image of the Sun. Each camera features 4k×4k pixels. The interference filters work as a band-pass filter that only transmits a selected wavelength range (i.e. color) of the sunlight. Four different interference filters are available in each channel that are mounted in a motorized fast-change filter wheel.

VBI blue channel (45 field of view)

VBI red channel (69 field of view)

Per wavelength, a burst of images shall be recorded with high frame rate (30 fps), digitally analyzed and formed into a single sharpened image (speckle-reconstruction).

VBI is fabricated by the National Solar Observatory.

Visible Spectro-Polarimeter (ViSP)[edit]

ViSP is fabricated by the High Altitude Observatory.

Visible Tunable Filter (VTF)[edit]

VTF is fabricated by the Kiepenheuer-Institut für Sonnenphysik.

Diffraction-Limited Near-InfraRed Spectro-Polarimeter (DL-NIRSP)[edit]

DL-NIRSP is a diffraction grating based integral field spectrograph with a spectral resolution R=250000. DL-NIRSP is fabricated by Institute for Astronomy (IfA) of the University of Hawaii.

Cryogenic Near-InfraRed Spectro-Polarimeter (Cryo-NIRSP)[edit]

Cryo-NIRSP is fabricated by Institute for Astronomy (IfA) of the University of Hawaii.


Partners[edit]

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

See also[edit]

References[edit]

Footnotes[edit]

  1. ^ "Solar Telescope Named for Late Senator Inouye". National Solar Observatory. 16 December 2013. Retrieved 21 October 2015.
  2. ^ "NSF Selects NSO to Build World's Largest Solar Telescope" (Press release). SpaceRef. 22 January 2010. Retrieved 2017-03-16.
  3. ^ "Building the DKIST – Image Gallery". dkist.nso.edu. Archived from the original on 13 September 2014. Retrieved 22 August 2015.
  4. ^ 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.)
  5. ^ "Primary mirror delivered to Daniel K. Inouye Solar Telescope" (Press release). National Science Foundation. 3 August 2017. News Release 17-072.
  6. ^ 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.
  7. ^ "Collaborating Institutions". dkist.nso.edu. Retrieved 14 May 2014.

Sources[edit]

External links[edit]