U.S. Naval Observatory Flagstaff - 1.55-m Astrometric Reflector

The 1.55-m Kaj Strand Astrometric Reflector

1.55-m Astrometric

This is the largest optical telescope operated by the U.S. Navy. It was designed and built under the direction of the Scientific Director of the U.S. Naval Observatory from 1963 - 1977, Dr. Kaj Aa. Strand. It was designed to produce extremely accurate astrometric measurements in small fields, and has been used to measure parallaxes and therefore distance for faint stars. Over 1000 of the world's most accurate stellar distances and proper motions have been measured with this telescope since 1964.

Telescope Data


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Last modified: 02 April 2015