Nicholas U. Mayall Telescope
Alternative namesMayall 4-meter Telescope
Part ofKitt Peak National Observatory Edit this on Wikidata
Location(s)Arizona
Coordinates31°57′48″N 111°36′00″W / 31.9634°N 111.6°W / 31.9634; -111.6
OrganizationNOIRLab Edit this on Wikidata
Altitude2,120 m (6,960 ft)
First lightFebruary 27, 1973[1]
DiscoveredMethane ice on Pluto
Telescope styleoptical telescope
Ritchey–Chrétien telescope Edit this on Wikidata
Diameter4 m (13 ft 1 in)
Collecting area11.4 m2 (123 sq ft)
Websitenoirlab.edu/public/programs/kitt-peak-national-observatory/nicholas-mayall-4m-telescope/
Nicholas U. Mayall Telescope is located in the United States
Nicholas U. Mayall Telescope
Location of Nicholas U. Mayall Telescope
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Kitt Peak—Mayall is the tall one
Looking out at Kitt Peak from Mayall

The Nicholas U. Mayall Telescope, also known as the Mayall 4-meter Telescope, is a four-meter (158 inches) reflector telescope located at the Kitt Peak National Observatory in Arizona and named after Nicholas U. Mayall. It saw first light on February 27, 1973, and was the second-largest telescope in the world at that time.[2] Initial observers included David Crawford, Nicholas Mayall, and Arthur Hoag.[2] It was dedicated on June 20, 1973 after Mayall's retirement as director.[2] The mirror has an f/2.7 hyperboloidal shape. It is made from a two-foot (61 cm (24 in)) thick fused quartz disk that is supported in an advanced-design mirror cell. The prime focus has a field of view six times larger than that of the Hale reflector. It is host to the Dark Energy Spectroscopic Instrument. The identical Víctor M. Blanco Telescope was later built at Cerro Tololo Inter-American Observatory, in Chile.[3]

Planning & construction

In 1961, after work had moved forward on other telescopes, Mayall proposed an even larger 150-inch mirror telescope for Kitt Peak.[4] Site construction began in 1968 and by 1971 the mirror was delivered to the site.[5] The mirror was made by Owens-Illinois[5] and made of fused quartz, valued for its low coefficient of thermal expansion. The blank was ground at the Kitt Peak optical lab.[4]

The telescope primary mirror is designed to function as the first element in a Ritchey–Chrétien optical design.[6] The telescope was originally designed with three focal point options: the prime focus, a wide-field R/C focus, and a coudé focus.[7]

The telescope was dedicated in the summer of 1973, at which time it was the second largest telescope by aperture in the world.[8] The telescope was named after Mayall who was the director of Kitt Peak National Observatory for over a decade.[8]

Instruments

Under the dome

Examples of instruments over its lifetime include various spectrographs, Cryogenic Camera, the Phoenix spectrometer, and the DLIRIM.[7]

The KNPO Mosaic camera was installed in 1998, and was designed for the prime focus.[9] This camera had eight 2048 × 4096 CCD sensors.[9] This led to another camera Mosaic II for the CTIO 4-m telescope in the southern hemisphere.[9]

Mosaic3

Mosaic3 was an imaging camera for the Mayall telescope.[10] This prime focus camera was used for a 3-band survey in support of the upcoming DESI instrument.[10]

Fourier Transform Spectrograph

One instrument used with telescope was the Fourier Transform Spectrograph.[11] The FTS was used between 1975 and 1995, creating an archive of recorded spectra.[12] It was noted for collecting infrared spectrum before the advent of infrared imaging arrays.[12]

Over the time of its operation 10,000 spectra were taken of 800 different astronomical targets, and these were made available in the SpArc data archive in the early 21st century.[12]

DESI

An instrument designed to help understand dark energy, installation of the Dark Energy Spectroscopic Instrument (DESI) was completed in late 2019.[13] Very little is known about dark energy, the supposed pressure responsible for the accelerating expansion rate of the universe.

DESI has five thousand fiber optic sensors, each one being robotically targetable at the focal plane.[13][14] Planned to examine the nature of millions of galaxies and quasars, the instrument has been a decade in construction and features contributions from hundreds of researchers.[13]

The telescope control software was also upgraded in the 2010s to prepare for DESI.[15]

DESI achieved first light in 2019 and was commissioned in March of 2020.[16] Due to the COVID-19 pandemic, full operations have been delayed until mid-2021.

Discoveries & observations

Image of Abell 30 by the 4-meter (158 inch) aperture Mayall telescope, a ground-based optical telescope.
Methane ice was confirmed by New Horizons fast Pluto flyby probe in 2015; Plutonian surface shown

In 1976 the Mayall Telescope was used to discover methane ice on planet Pluto.[17]

The FTS on Mayall was also used to study methane in the outer solar system in the 1980s.[18] The study included observation of monodeutered methane on Titan, a moon of Saturn noted for its thick atmosphere.[18] The Mayall was also one of several large telescopes that was part of a study of the Andromeda galaxy.[19] The observations helped understand the history of that galaxy, which in turn helps understand Earth's galaxy, the Milky Way.[19]

Contemporaries on commissioning

The Mayall was the second-largest telescope when inaugurated, between the Hale (5 m) and Shane (3 m).

Largest telescopes 1973:

# Name /
Observatory		 Image Aperture Altitude First
Light		 Special advocate
1 Hale Telescope
Palomar Obs.		 200 inch
508 cm		 1713 m
(5620 ft)		 1949 George Ellery Hale
2 Mayall Telescope
Kitt Peak National Obs.		 158 inch
401 cm		 2120 m
(6955 ft)		 1973 Nicholas Mayall
3 Shane Telescope
Lick Observatory		 120 inch
305 cm		 1283 m
(4209 ft)		 1959 Nicholas Mayall
C. Donald Shane
4 Harlan J. Smith Telescope
McDonald Observatory		 107 in
270 cm		 2070 m
(6791 ft)		 1968 Harlan J. Smith

Here is the dedication of the telescope with its namesake at the eyepiece:

A man in his 60s looking into the eyepiece of a large telescope.
Mayall on March 2, 1973 viewing through the telescope to be named in his honor.

Observation examples

See also

References

  1. ↑ "The Mayall 4-Meter Telescope". Archived from the original on 2020-01-07. Retrieved 2019-11-10.
  2. 1 2 3 Lindsley, Dave; Edmondson, Frank; Kiani, Shiva (2008), Celebrating 50 years; Kitt Peak National Observatory; Milestones at Kitt Peak (PDF), archived (PDF) from the original on 2009-08-16, retrieved 2009-10-24
  3. ↑ Robert D. Chapman; William M. Sinton. "Telescope". AccessScience@McGraw-Hill. doi:10.1036/1097-8542.681600. {{cite journal}}: Cite journal requires |journal= (help)
  4. 1 2 Leverington, David (2017). Observatories and Telescopes of Modern Times. Cambridge University Press. ISBN 9780521899932. Archived from the original on 2021-10-15. Retrieved 2021-10-15.
  5. 1 2 "Mayall 4-Meter Telescope: History". www.noao.edu. Archived from the original on 2016-03-11. Retrieved 2019-11-07.
  6. ↑ Hoag, A. A. (1972). Instrumentation for the KPNO and CTIO 4 meter reflectors. ESO/CERN Conference on Auxiliary Instrumentation for Large Telescopes. p. 39. Bibcode:1972ailt.conf...39H.
  7. 1 2 "Mayall 4-Meter Telescope: Instruments". www.noao.edu. Archived from the original on 2016-03-11. Retrieved 2019-11-09.
  8. 1 2 "Kitt Peak opens up its 158‐inch telescope", Physics Today (letter), 26 (5): 19, 2008-12-29, doi:10.1063/1.3128047
  9. 1 2 3 Dey, Arjun; Valdes, Francisco (2014-03-01). "The Delivered Image Quality with the MOSAIC Cameras at the Kitt Peak 4 m Mayall and Cerro Tololo 4 m Blanco Telescopes". Publications of the Astronomical Society of the Pacific. 126 (937): 296. Bibcode:2014PASP..126..296D. doi:10.1086/675808. ISSN 1538-3873.
  10. 1 2 Dey, Arjun; Rabinowitz, David; Karcher, Armin; Bebek, Chris; Baltay, Charles; Sprayberry, David; Valdes, Frank; Stupak, Bob; Donaldson, John; Emmet, Will; Hurteau, Tom (August 2016). Evans, Christopher J; Simard, Luc; Takami, Hideki (eds.). "Mosaic3: a red-sensitive upgrade for the prime focus camera at the Mayall 4m telescope". Ground-based and Airborne Instrumentation for Astronomy VI. 9908: 99082C. Bibcode:2016SPIE.9908E..2CD. doi:10.1117/12.2231488. S2CID 125204403.
  11. ↑ "Mayall 4-Meter Telescope: Instruments". www.noao.edu. Archived from the original on 2016-03-11. Retrieved 2019-11-07.
  12. 1 2 3 Pilachowski, C. A.; Hinkle, K. H.; Young, M. D.; Dennis, H. B.; Gopu, A.; Henschel, R.; Hayashi, S. (January 2017). "An Archive of Spectra from the Mayall Fourier Transform Spectrometer at Kitt Peak". Publications of the Astronomical Society of the Pacific. 129 (972): 024006. arXiv:1610.02535. Bibcode:2017PASP..129b4006P. doi:10.1088/1538-3873/129/972/024006. ISSN 1538-3873. S2CID 119268330.
  13. 1 2 3 "Kitt Peak Instrument To Study Dark Energy Begins Final Tests". KJZZ. 2019-10-31. Archived from the original on 2019-11-07. Retrieved 2019-11-07.
  14. ↑ Roberts, Glenn Jr. (28 October 2019). "DESI opens its 5000 eyes". symmetry magazine. Archived from the original on 2021-01-25. Retrieved 2019-11-07.
  15. ↑ Abareshi, Behzad; Marshall, Robert; Gott, Shelby; Sprayberry, David; Cantarutti, Rolando; Joyce, Dick; Williams, Doug; Probst, Ronald; Reetz, Kristin; Paat, Anthony; Butler, Karen; Soto, Christian; Dey, Arjun; Summers, David (2016). Chiozzi, Gianluca; Guzman, Juan C (eds.). "A new telescope control software for the Mayall 4-meter telescope". Software and Cyberinfrastructure for Astronomy IV. 9913: 99131O. Bibcode:2016SPIE.9913E..1OA. doi:10.1117/12.2233087. S2CID 58000493.
  16. ↑ Lincoln, Don. "Super New Telescope Opens Its Eyes For The First Time". Forbes. Archived from the original on 2019-11-09. Retrieved 2019-11-09.
  17. ↑ Leverington, David (2003-05-29). Babylon to Voyager and Beyond: A History of Planetary Astronomy. Cambridge University Press. ISBN 9780521808408. Archived from the original on 2021-10-15. Retrieved 2021-10-15.
  18. 1 2 De Bergh, C.; Lutz, B. L.; Owen, T.; Chauville, J. (1988). "1988ApJ...329..951D Page 951". The Astrophysical Journal. 329: 951. Bibcode:1988ApJ...329..951D. doi:10.1086/166439.
  19. 1 2 "Two Ancient Migration Events In The Andromeda Galaxy – SpaceRef". spaceref.com. 3 October 2019. Archived from the original on 2021-10-15. Retrieved 2019-11-09.
  20. ↑ "DESI Team Receives Project Management Excellence Award from Department of Energy". Retrieved December 2, 2021.
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