GREGOR Solar Telescope

{{short description|Solar telescope in the Canary Islands}}

{{Infobox telescope|locmapin=Canary Islands}}

GREGOR is a solar telescope, equipped with a 1.5-metre primary mirror,{{cite web |title=Präziser Blick in die Sonne dank temperaturstabiler Glaskeramik |url=http://www.schott.com/english/news/press.html?NID=com3688 |date=2012-05-30 |accessdate=2016-04-14 |archive-date=2019-03-29 |archive-url=https://web.archive.org/web/20190329090028/https://www.schott.com/english/news/press.html?NID=com3688 |url-status=dead }} 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.{{cite web|title=GREGOR Telescope|url=http://www.kis.uni-freiburg.de/index.php?id=163&L=1 |work=KIS website|publisher=Kiepenheuer-Institut für Sonnenphysik|accessdate=11 January 2014}}{{cite web|title=GREGOR|url=http://www.iac.es/eno.php?op1=3&op2=6&lang=en&id=3 |work=IAC website|publisher=Instituto de Astrofísica de Canarias|accessdate=11 January 2014}} First light, using a 1-metre test mirror, was on {{Start date|2009|3|12}}.First light was obtained with a 1-meter test-mirror due to manufacturing issues with the main mirror{{cite web|title=GREGOR telescope: Zooming in on the sun|url=http://phys.org/news/2012-05-gregor-telescope-sun.html |work=phys.org website|publisher=phys.org|accessdate=11 January 2014|date=May 10, 2012}}

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.{{cite web|title=GREGOR Optical Design|url=http://www.kis.uni-freiburg.de/index.php?id=165&L=1 |work=KIS website|publisher=Kiepenheuer-Institut für Sonnenphysik|accessdate=11 January 2014}}{{update after|2015}}