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O'Brien Observatory : ウィキペディア英語版 | O'Brien Observatory
The O'Brien Observatory (OBO) is an astronomical observatory located in the city of Marine on St. Croix, Minnesota (USA), about northeast of Minneapolis. The observatory is owned and operated by the University of Minnesota and opened in 1968. It has one telescope, a Cassegrain reflector capable of observing at both optical and infrared wavelengths.〔 It is used for primarily for instruction and instrument testing, and occasionally for research purposes.〔 ==See also==
* Mount Lemmon Observatory * List of observatories
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