GREGOR Solar Telescope

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GREGOR is a solar telescope, equipped with a 1.5-metre primary mirror,[1] located at 2,390 m altitude at the Teide Observatory on Tenerife in the Canary Islands. It replaces the older Gregory Coudé Telescope and was inaugurated on May 21, 2012.[2][3] First light, using a 1-metre test mirror, was on March 12, 2009 (2009-03-12).[4][5]

GREGOR is the third-largest solar telescope in the world, after the Big Bear Observatory and the McMath-Pierce solar telescope. It is aimed at observing the solar photosphere and chromosphere at visible and infrared wavelengths. GREGOR sports a high-order adaptive optics (AO) system with a 256-actuator deformable mirror and a 156-subaperture Shack-Hartmann wavefront sensor. Efforts are underway to implement multi-conjugate AO in 2014.[6][needs update]

## Contents

* 1 2020 upgrade
* 2 See also
* 3 References
* 4 Sources

## 2020 upgrade

Initial astigmatism was fixed during an upgrade with some corrective optics: two off-axis parabolic mirrors.[7]

## See also

* Astronomy:Vacuum Tower Telescope - Solar telescope on Tenerife operated by KIS
* Astronomy:Swedish Solar Telescope - Telescope on La Plama, Canary Islands
* Astronomy:Dutch Open Telescope
* List of solar telescopes

## References

1. ↑ "Präziser Blick in die Sonne dank temperaturstabiler Glaskeramik". 2012-05-30. http://www.schott.com/english/news/press.html?NID=com3688. Retrieved 2016-04-14.
2. ↑ "GREGOR Telescope". KIS website. Kiepenheuer-Institut für Sonnenphysik. http://www.kis.uni-freiburg.de/index.php?id=163&L=1. Retrieved 11 January 2014.
3. ↑ "GREGOR". IAC website. Instituto de Astrofísica de Canarias. http://www.iac.es/eno.php?op1=3&op2=6&lang=en&id=3. Retrieved 11 January 2014.
4. ↑ First light was obtained with a 1-meter test-mirror due to manufacturing issues with the main mirror
5. ↑ "GREGOR telescope: Zooming in on the sun". phys.org website. phys.org. May 10, 2012. http://phys.org/news/2012-05-gregor-telescope-sun.html. Retrieved 11 January 2014.
6. ↑ "GREGOR Optical Design". KIS website. Kiepenheuer-Institut für Sonnenphysik. http://www.kis.uni-freiburg.de/index.php?id=165&L=1. Retrieved 11 January 2014.
7. ↑ Europe's largest Solar Telescope GREGOR unveils magnetic details of the Sun Sept 2020

## Sources

* "GREGOR - A New Telescope for Solar Physics". AIP website. Leibniz Institute for Astrophysics Potsdam. http://www.aip.de/groups/gregor/. Retrieved 11 January 2014.

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