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Large Altazimuth Telescope

(BTA-6, Bol'shoi Teleskop Azimultal'nyi)
(6 meter reflector telescope in Russia)

The Large Altazimuth Telescope (BTA-6 or Bol'shoi Teleskop Azimultal'nyi) is a 6m reflector telescope in southern Russia, that began operation in 1975 and was the world's largest optical telescope until Keck's 1990 first light.

BTA-6 has a monolithic mirror and is of the Ritchey-Chrétien telescope design. It has an altazimuth mount and was a pioneer in using such a mount under computer control for a large research telescope. Over much of BTA-6's life, it has had mirror flaws, with a third mirror installed in 1978 and used until 2018, when the second mirror was reinstalled after substantial regrinding to eliminate its problems.

Instruments:


(telescope,reflector,ground,Russia)
http://en.wikipedia.org/wiki/BTA-6
https://www.sao.ru/Doc-en/Telescopes/bta/descrip.html
https://pages.astronomy.ua.edu/keel/telescopes/bta.html
https://www.skyandtelescope.com/astronomy-news/new-eye-for-giant-russian-telescope/

Referenced by:
Hale Telescope
monolithic mirror
segmented mirror

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