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- Q787671 subject Q7010353.
- Q787671 subject Q7018802.
- Q787671 subject Q7021614.
- Q787671 abstract "The BTA-6 (Russian: Большой Телескоп Альт-азимутальный, Bolshoi Teleskop Alt-azimutalnyi, Large Altazimuth Telescope) is a 6-metre (20 ft) aperture optical telescope at the Special Astrophysical Observatory located in the Zelenchuksky District on the north side of the Caucasus Mountains in southern Russia.The BTA-6 achieved first light in late 1975, making it the largest telescope in the world until 1990, when it was surpassed by the partially constructed Keck 1. It pioneered the technique, now standard in large astronomical telescopes, of using an altazimuth mount with a computer-controlled derotator.For a variety of reasons, BTA-6 was never able to operate near its theoretical limits. Early problems with poorly fabricated mirror glass were addressed in 1978, fixing the most serious issue. But due to its location down-wind of numerous large mountain peaks, astronomical seeing is rarely good. The telescope also suffers from serious thermal expansion problems due to the large thermal mass of the mirror, and the dome as a whole which is much larger than necessary. Upgrades have taken place throughout the system's history and are ongoing to this day.".
- Q787671 thumbnail Big_asimutal_teleskop.jpg?width=300.
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- Q787671 wikiPageExternalLink descrip.html.
- Q787671 wikiPageExternalLink Telescopes.
- Q787671 wikiPageExternalLink index.html.
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- Q787671 point "43.646825 41.440447222222225".
- Q787671 type SpatialThing.
- Q787671 comment "The BTA-6 (Russian: Большой Телескоп Альт-азимутальный, Bolshoi Teleskop Alt-azimutalnyi, Large Altazimuth Telescope) is a 6-metre (20 ft) aperture optical telescope at the Special Astrophysical Observatory located in the Zelenchuksky District on the north side of the Caucasus Mountains in southern Russia.The BTA-6 achieved first light in late 1975, making it the largest telescope in the world until 1990, when it was surpassed by the partially constructed Keck 1.".
- Q787671 label "BTA-6".
- Q787671 lat "43.646825".
- Q787671 long "41.440447222222225".
- Q787671 depiction Big_asimutal_teleskop.jpg.
- Q787671 homepage descrip.html.