The GREGOR Telescope
The GREGOR telescope is the new 1.5 m solar telescope currently assembled on Tenerife, Spain. It has three mirrors with a focal length of 50m. It is an open telescope. The main mirror is made of a silicon-carbide material (CESIC) with high thermal conduction, and it is air-cooled from the backside. This makes the adaptive optics functional.
What is it designed to do?
Gregor will be able to measure many physical parameters of the Sun at a new level of precision. It is a solar telescope designed to look at the magnetic field and the gas motion in the solar photosphere.
Scientists expect to gain better understanding of solar effects like eruptions or Sun spots. The scope provides a resolution of 70km on the Sun, and high resolution stellar spectroscopy.
The images generated by GREGOR are sensitive to the ambient or main mirror temperatures. These temperature differences are important when studying solar images since in addition to light, high temperatures will shape the image and determine how it is distorted.
Facts about the telescope:
Currently assembled on Tenerife, Spain, expected to be operational in 2010.
The structure of the GREGOR telescope is open with stiff Serrurier struts and an Alt-Azimuth mounting.
1.5 m completely open telescope with a retractable dome, to avoid internal seeing.
- M2 (D=0.43m) and M3 (D=0,36m) passive cooled
- primary mirror (D=1,5m) active thermally controlled
- night time observations possible
- wavelength range from 350nm to several µm
- effective focal length: 55.6m (F/38)
- Image de-rotatornominal field of view 150" (max. 300")
- integrated adaptive optics
- light weighted optics
- Gregory configuration with additional tertiary mirror (M3)
Image source: Kiepenheuer-Institut fuer Sonnenphysik