GREGOR Solar Telescope

GREGOR is a solar telescope, equipped with a 1.5 m 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

Location(s)	Tenerife, Atlantic Ocean, international waters
Coordinates	28°18′06″N 16°30′39″W
Wavelength	350 nm (860 THz)–2,000 nm (150 THz)
Diameter	1.5 m (4 ft 11 in)
Focal length	55.6 m (182 ft 5 in)
Website	www.leibniz-kis.de/en/observatories/gregor/
Location of GREGOR Solar Telescope
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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 mirrors and a 156-subaperture Shack-Hartmann wavefront sensor. Efforts are underway to implement multi-conjugate AO in 2014.^{[6][needs update]}

2014-2020

2020 upgrade

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

See also

• Vacuum Tower Telescope – Solar telescope on Tenerife operated by KIS
• Swedish Solar Telescope – Telescope on La Plama, Canary Islands
• Dutch Open Telescope
• Roque de los Muchachos Observatory – Astronomical observatory on La Palma, Canary Islands
• List of solar telescopes