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BTA-6

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description BTA-6 Overview

The BTA-6, or Large Azimuthal Telescope, is a 6-meter optical reflecting telescope located in the Caucasus Mountains of southern Russia. Completed in 1975 and operated by the Special Astrophysical Observatory of the Russian Academy of Sciences, it was the largest single-mirror telescope in the world until 1993. The telescope utilizes an alt-azimuth mount and has played a significant role in astronomical research, despite early challenges with the quality of its primary mirror. It remains one of the largest optical telescopes in Eurasia.

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What does BTA-6 stand for?

BTA means Large Azimuthal Telescope, from the Russian name Bolshoi Teleskop Altazimutalny. It is a 6-metre optical reflector operated by the Special Astrophysical Observatory of the Russian Academy of Sciences. [Special Astrophysical Observatory](https://observatories.ru/bta/)

When did BTA-6 begin operating?

BTA-6 began work in December 1975 after reaching first light that year. Its 6-metre primary mirror made it a landmark in the development of very large single-mirror telescopes. [Special Astrophysical Observatory](https://observatories.ru/bta/)

Why was BTA-6 historically famous?

For years it was the world's largest single-primary-mirror optical telescope. Later giant telescopes increasingly used segmented mirrors, so BTA-6 remains important as a large rigid-mirror design. [Special Astrophysical Observatory](https://observatories.ru/bta/)

What kind of astronomy is BTA-6 used for?

Its large aperture is suited to spectroscopy and detailed observations of faint astronomical objects, including distant galaxies and stars. The telescope remains a major research instrument at the Caucasus observatory site. [Special Astrophysical Observatory](https://observatories.ru/bta/)

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