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The 2.1-meter Struve Warner & Swasey reflector, commonly known as the Otto Struve Telescope, is a historic optical telescope located at McDonald Observatory in the Davis Mountains of West Texas. Commissioned in 1939 and named in honor of astronomer Otto Struve in 1966, it was the largest telescope in Texas and one of the largest in the world at the time. Designed by the Warner & Swasey Company, the telescope features an 82-inch (2.1-meter) mirror and was instrumental in the development of the Johnson-Morgan UBV photometric system. Notably, in 1949, astronomer Gerard Kuiper discovered Neptune's moon Nereid using this telescope. Despite its age, the Otto Struve Telescope remains operational, celebrating its 85th year of service in May 2024 .
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