 The Smithsonian Astrophysical Observatory also operated a dozen 3.5 ton Baker-Nunn Camera systems (none at Johnston) for cataloging of man-made satellites.The U.S. Air Force had ten Baker-Nunn camera stations around the world mostly from 1960 to 1977 with a phase-out beginning in 1964.The Baker-Nunn space camera station was constructed on Sand Island and was functioning by 1965.