The O'Brien Observatory (OBO) is an astronomical observatory in the city of Marine on St. Croix, Minnesota, United States, 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 astronomical observatories
References
External links Department of Astronomy Infrared Laboratory at the University of Minnesota Lee & Rose Warner Nature Center Clear Sky Chart Forecasts of observing conditions approximately 4.5 km west of OBO.