O'Brien Observatory

O'Brien Observatory in Marine on St. Croix, Minnesota, about thirty-five kilometers northeast of Minneapolis, is an astronomical observatory operated by the University of Minnesota since opening in 1968. The facility is built around a single 0.76-meter Cassegrain reflector, a thirty-inch telescope capable of observing in both optical and infrared wavelengths. Its chief role is instruction, while the telescope also serves for testing instruments and is sometimes used for research.

Marine on St. Croix, Minnesota · United States